165739980 has 48 divisors (see below), whose sum is σ = 530369280. Its totient is φ = 37883328.

The previous prime is 165739979. The next prime is 165739991. The reversal of 165739980 is 89937561.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196890 + ... + 197729.

It is an arithmetic number, because the mean of its divisors is an integer number (11049360).

Almost surely, 2^165739980 is an apocalyptic number.

165739980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165739980 is an abundant number, since it is smaller than the sum of its proper divisors (364629300).

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

165739980 is a wasteful number, since it uses less digits than its factorization.

165739980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394638 (or 394636 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 165739980 is about 12874.0040391480. The cubic root of 165739980 is about 549.2993612869.

The spelling of 165739980 in words is "one hundred sixty-five million, seven hundred thirty-nine thousand, nine hundred eighty".