161745177528 has 48 divisors (see below), whose sum is σ = 477883481400. Its totient is φ = 49013689920.

The previous prime is 161745177527. The next prime is 161745177631. The reversal of 161745177528 is 825771547161.

It is a happy number.

161745177528 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 45 + 1 + 77 + 528 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161745177521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102111063 + ... + 102112646.

Almost surely, 2^161745177528 is an apocalyptic number.

161745177528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161745177528 is an abundant number, since it is smaller than the sum of its proper divisors (316138303872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161745177528 is a wasteful number, since it uses less digits than its factorization.

161745177528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204223732 (or 204223725 counting only the distinct ones).

The product of its digits is 3292800, while the sum is 54.

The spelling of 161745177528 in words is "one hundred sixty-one billion, seven hundred forty-five million, one hundred seventy-seven thousand, five hundred twenty-eight".