165864655 has 8 divisors (see below), whose sum is σ = 217131984. Its totient is φ = 120628800.

The previous prime is 165864617. The next prime is 165864679. The reversal of 165864655 is 556468561.

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

It is not a de Polignac number, because 165864655 - 2⁷ = 165864527 is a prime.

It is a super-2 number, since 2×165864655² = 55022167556538050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1507806 + ... + 1507915.

It is an arithmetic number, because the mean of its divisors is an integer number (27141498).

Almost surely, 2^165864655 is an apocalyptic number.

165864655 is a deficient number, since it is larger than the sum of its proper divisors (51267329).

165864655 is a wasteful number, since it uses less digits than its factorization.

165864655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015737.

The product of its digits is 864000, while the sum is 46.

The square root of 165864655 is about 12878.8452510309. The cubic root of 165864655 is about 549.4370603765.

The spelling of 165864655 in words is "one hundred sixty-five million, eight hundred sixty-four thousand, six hundred fifty-five".