161128878687 has 18 divisors (see below), whose sum is σ = 270740361528. Its totient is φ = 92073644712.

The previous prime is 161128878667. The next prime is 161128878721. The reversal of 161128878687 is 786878821161.

161128878687 is a `hidden beast` number, since 1 + 611 + 2 + 8 + 8 + 7 + 8 + 6 + 8 + 7 = 666.

It is not a de Polignac number, because 161128878687 - 2⁸ = 161128878431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161128878667) 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 17 ways as a sum of consecutive naturals, for example, 182685363 + ... + 182686244.

It is an arithmetic number, because the mean of its divisors is an integer number (15041131196).

Almost surely, 2^161128878687 is an apocalyptic number.

161128878687 is a deficient number, since it is larger than the sum of its proper divisors (109611482841).

161128878687 is a wasteful number, since it uses less digits than its factorization.

161128878687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365371627 (or 365371617 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 63.

The spelling of 161128878687 in words is "one hundred sixty-one billion, one hundred twenty-eight million, eight hundred seventy-eight thousand, six hundred eighty-seven".