165158780 has 48 divisors (see below), whose sum is σ = 355332096. Its totient is φ = 64464960.

The previous prime is 165158779. The next prime is 165158789. The reversal of 165158780 is 87851561.

It is a super-2 number, since 2×165158780² = 54554845222176800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165158789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151397 + ... + 152483.

It is an arithmetic number, because the mean of its divisors is an integer number (7402752).

Almost surely, 2^165158780 is an apocalyptic number.

165158780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165158780 is an abundant number, since it is smaller than the sum of its proper divisors (190173316).

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

165158780 is a wasteful number, since it uses less digits than its factorization.

165158780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 41.

The square root of 165158780 is about 12851.4115956186. The cubic root of 165158780 is about 548.6565337047.

The spelling of 165158780 in words is "one hundred sixty-five million, one hundred fifty-eight thousand, seven hundred eighty".