161687375037 has 12 divisors (see below), whose sum is σ = 247286573820. Its totient is φ = 101450901888.

The previous prime is 161687375023. The next prime is 161687375117. The reversal of 161687375037 is 730573786161.

161687375037 is a `hidden beast` number, since 1 + 6 + 1 + 68 + 73 + 7 + 503 + 7 = 666.

161687375037 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 145122140601 + 16565234436 = 380949^2 + 128706^2 .

It is not a de Polignac number, because 161687375037 - 2⁴ = 161687375021 is a prime.

It is a super-2 number, since 2×161687375037² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161687375137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 528389962 + ... + 528390267.

It is an arithmetic number, because the mean of its divisors is an integer number (20607214485).

Almost surely, 2^161687375037 is an apocalyptic number.

161687375037 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161687375037 is a deficient number, since it is larger than the sum of its proper divisors (85599198783).

161687375037 is a wasteful number, since it uses less digits than its factorization.

161687375037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056780252 (or 1056780249 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 54.

The spelling of 161687375037 in words is "one hundred sixty-one billion, six hundred eighty-seven million, three hundred seventy-five thousand, thirty-seven".