165970890 has 64 divisors (see below), whose sum is σ = 465897600. Its totient is φ = 41928192.

The previous prime is 165970879. The next prime is 165970907. The reversal of 165970890 is 98079561.

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

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 31 ways as a sum of consecutive naturals, for example, 11047 + ... + 21306.

It is an arithmetic number, because the mean of its divisors is an integer number (7279650).

Almost surely, 2^165970890 is an apocalyptic number.

165970890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165970890 is an abundant number, since it is smaller than the sum of its proper divisors (299926710).

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

165970890 is a wasteful number, since it uses less digits than its factorization.

165970890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32388 (or 32382 counting only the distinct ones).

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

The square root of 165970890 is about 12882.9689901047. The cubic root of 165970890 is about 549.5543387057.

The spelling of 165970890 in words is "one hundred sixty-five million, nine hundred seventy thousand, eight hundred ninety".