165770815 has 16 divisors (see below), whose sum is σ = 235183680. Its totient is φ = 109751040.

The previous prime is 165770807. The next prime is 165770827. The reversal of 165770815 is 518077561.

It is not a de Polignac number, because 165770815 - 2³ = 165770807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80646 + ... + 82675.

It is an arithmetic number, because the mean of its divisors is an integer number (14698980).

Almost surely, 2^165770815 is an apocalyptic number.

165770815 is a deficient number, since it is larger than the sum of its proper divisors (69412865).

165770815 is a wasteful number, since it uses less digits than its factorization.

165770815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163362.

The product of its (nonzero) digits is 58800, while the sum is 40.

The square root of 165770815 is about 12875.2015518205. The cubic root of 165770815 is about 549.3334238700. Note that the first 3 decimals are identical.

The spelling of 165770815 in words is "one hundred sixty-five million, seven hundred seventy thousand, eight hundred fifteen".