161169710520 has 256 divisors, whose sum is σ = 614285844480. Its totient is φ = 32908032000.

The previous prime is 161169710501. The next prime is 161169710617. The reversal of 161169710520 is 25017961161.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 100470 + ... + 576570.

It is an arithmetic number, because the mean of its divisors is an integer number (2399554080).

Almost surely, 2^161169710520 is an apocalyptic number.

161169710520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161169710520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307142922240).

161169710520 is an abundant number, since it is smaller than the sum of its proper divisors (453116133960).

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

161169710520 is a wasteful number, since it uses less digits than its factorization.

161169710520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476166 (or 476162 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The spelling of 161169710520 in words is "one hundred sixty-one billion, one hundred sixty-nine million, seven hundred ten thousand, five hundred twenty".