161572069888 has 80 divisors (see below), whose sum is σ = 342267156000. Its totient is φ = 75982897152.

The previous prime is 161572069861. The next prime is 161572069903. The reversal of 161572069888 is 888960275161.

It is a super-2 number, since 2×161572069888² (a number of 23 digits) contains 22 as substring.

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, 1292448 + ... + 1411936.

It is an arithmetic number, because the mean of its divisors is an integer number (4278339450).

Almost surely, 2^161572069888 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 161572069888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171133578000).

161572069888 is an abundant number, since it is smaller than the sum of its proper divisors (180695086112).

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

161572069888 is a wasteful number, since it uses less digits than its factorization.

161572069888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119665 (or 119649 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 61.

The spelling of 161572069888 in words is "one hundred sixty-one billion, five hundred seventy-two million, sixty-nine thousand, eight hundred eighty-eight".