161787363984 has 75 divisors (see below), whose sum is σ = 468301483353. Its totient is φ = 53924294592.

The previous prime is 161787363919. The next prime is 161787364007. The reversal of 161787363984 is 489363787161.

The square root of 161787363984 is 402228.

It is a perfect power (a square), and thus also a powerful number.

161787363984 is a `hidden beast` number, since 1 + 6 + 178 + 73 + 6 + 398 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 75746048400 + 86041315584 = 275220^2 + 293328^2 .

It is a super-2 number, since 2×161787363984² (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 14 ways as a sum of consecutive naturals, for example, 14474622 + ... + 14485794.

Almost surely, 2^161787363984 is an apocalyptic number.

161787363984 is the 402228-th square number.

It is an amenable number.

161787363984 is an abundant number, since it is smaller than the sum of its proper divisors (306514119369).

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

161787363984 is an frugal number, since it uses more digits than its factorization.

161787363984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22366 (or 11178 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 161787363984 in words is "one hundred sixty-one billion, seven hundred eighty-seven million, three hundred sixty-three thousand, nine hundred eighty-four".