165496981986 has 48 divisors (see below), whose sum is σ = 414739450944. Its totient is φ = 46715152032.

The previous prime is 165496981973. The next prime is 165496981997. The reversal of 165496981986 is 689189694561.

165496981986 is a `hidden beast` number, since 1 + 6 + 549 + 69 + 8 + 19 + 8 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7902001 + ... + 7922916.

It is an arithmetic number, because the mean of its divisors is an integer number (8640405228).

Almost surely, 2^165496981986 is an apocalyptic number.

165496981986 is an abundant number, since it is smaller than the sum of its proper divisors (249242468958).

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

165496981986 is a wasteful number, since it uses less digits than its factorization.

165496981986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15825015 (or 15825012 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 72.

The spelling of 165496981986 in words is "one hundred sixty-five billion, four hundred ninety-six million, nine hundred eighty-one thousand, nine hundred eighty-six".