161535652178 has 16 divisors (see below), whose sum is σ = 242951304960. Its totient is φ = 80552082000.

The previous prime is 161535652171. The next prime is 161535652199. The reversal of 161535652178 is 871256535161.

It is a super-2 number, since 2×161535652178² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161535652171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1619453 + ... + 1716303.

It is an arithmetic number, because the mean of its divisors is an integer number (15184456560).

Almost surely, 2^161535652178 is an apocalyptic number.

161535652178 is a deficient number, since it is larger than the sum of its proper divisors (81415652782).

161535652178 is a wasteful number, since it uses less digits than its factorization.

161535652178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99073.

The product of its digits is 1512000, while the sum is 50.

The spelling of 161535652178 in words is "one hundred sixty-one billion, five hundred thirty-five million, six hundred fifty-two thousand, one hundred seventy-eight".