161043723135 has 72 divisors (see below), whose sum is σ = 285115046112. Its totient is φ = 84068006400.

The previous prime is 161043723133. The next prime is 161043723149. The reversal of 161043723135 is 531327340161.

161043723135 is a `hidden beast` number, since 1 + 610 + 4 + 3 + 7 + 2 + 3 + 1 + 35 = 666.

It is not a de Polignac number, because 161043723135 - 2¹ = 161043723133 is a prime.

It is a super-2 number, since 2×161043723135² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161043723135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161043723133) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 216747574 + ... + 216748316.

It is an arithmetic number, because the mean of its divisors is an integer number (3959931196).

Almost surely, 2^161043723135 is an apocalyptic number.

161043723135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161043723135 is a deficient number, since it is larger than the sum of its proper divisors (124071322977).

161043723135 is an equidigital number, since it uses as much as digits as its factorization.

161043723135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 161043723135 in words is "one hundred sixty-one billion, forty-three million, seven hundred twenty-three thousand, one hundred thirty-five".