165523970 has 16 divisors (see below), whose sum is σ = 305210808. Its totient is φ = 64594560.

The previous prime is 165523949. The next prime is 165523993. The reversal of 165523970 is 79325561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 103571329 + 61952641 = 10177^2 + 7871^2 .

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 7 ways as a sum of consecutive naturals, for example, 201449 + ... + 202268.

Almost surely, 2^165523970 is an apocalyptic number.

165523970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165523970 is a deficient number, since it is larger than the sum of its proper divisors (139686838).

165523970 is a wasteful number, since it uses less digits than its factorization.

165523970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403765.

The product of its (nonzero) digits is 56700, while the sum is 38.

The square root of 165523970 is about 12865.6119170446. The cubic root of 165523970 is about 549.0606223900.

The spelling of 165523970 in words is "one hundred sixty-five million, five hundred twenty-three thousand, nine hundred seventy".