161908524544 has 80 divisors (see below), whose sum is σ = 351130526208. Its totient is φ = 74138222592.

The previous prime is 161908524517. The next prime is 161908524641. The reversal of 161908524544 is 445425809161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749544 + ... + 941080.

Almost surely, 2^161908524544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161908524544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175565263104).

161908524544 is an abundant number, since it is smaller than the sum of its proper divisors (189222001664).

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

161908524544 is a wasteful number, since it uses less digits than its factorization.

161908524544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191695 (or 191679 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 161908524544 in words is "one hundred sixty-one billion, nine hundred eight million, five hundred twenty-four thousand, five hundred forty-four".