165997080 has 64 divisors (see below), whose sum is σ = 553327200. Its totient is φ = 44265600.

The previous prime is 165997079. The next prime is 165997103. The reversal of 165997080 is 80799561.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75771 + ... + 77930.

Almost surely, 2^165997080 is an apocalyptic number.

165997080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165997080 is an abundant number, since it is smaller than the sum of its proper divisors (387330120).

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

165997080 is a wasteful number, since it uses less digits than its factorization.

165997080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153721 (or 153711 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 165997080 is about 12883.9854082500. The cubic root of 165997080 is about 549.5832435157.

The spelling of 165997080 in words is "one hundred sixty-five million, nine hundred ninety-seven thousand, eighty".