165690057 has 8 divisors (see below), whose sum is σ = 237913984. Its totient is φ = 101963088.

The previous prime is 165690047. The next prime is 165690059. The reversal of 165690057 is 750096561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165690057 - 2⁷ = 165689929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 4248463 = 165690057 / (1 + 6 + 5 + 6 + 9 + 0 + 0 + 5 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165689997 and 165690024.

It is not an unprimeable number, because it can be changed into a prime (165690059) by changing a digit.

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, 2124193 + ... + 2124270.

It is an arithmetic number, because the mean of its divisors is an integer number (29739248).

Almost surely, 2^165690057 is an apocalyptic number.

It is an amenable number.

165690057 is a deficient number, since it is larger than the sum of its proper divisors (72223927).

165690057 is a wasteful number, since it uses less digits than its factorization.

165690057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248479.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 165690057 is about 12872.0649858521. The cubic root of 165690057 is about 549.2442037527.

The spelling of 165690057 in words is "one hundred sixty-five million, six hundred ninety thousand, fifty-seven".