161587982800 has 60 divisors (see below), whose sum is σ = 388261774656. Its totient is φ = 64627427200.

The previous prime is 161587982797. The next prime is 161587982839. The reversal of 161587982800 is 8289785161.

It is a super-2 number, since 2×161587982800² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4247865 + ... + 4285735.

Almost surely, 2^161587982800 is an apocalyptic number.

161587982800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161587982800 is an abundant number, since it is smaller than the sum of its proper divisors (226673791856).

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

161587982800 is a wasteful number, since it uses less digits than its factorization.

161587982800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48556 (or 48545 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 55.

The spelling of 161587982800 in words is "one hundred sixty-one billion, five hundred eighty-seven million, nine hundred eighty-two thousand, eight hundred".