165377601 has 6 divisors (see below), whose sum is σ = 238878770. Its totient is φ = 110251728.

The previous prime is 165377579. The next prime is 165377603. The reversal of 165377601 is 106773561.

165377601 is a `hidden beast` number, since 16 + 5 + 37 + 7 + 601 = 666.

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 44355600 = 11001^2 + 6660^2 .

It is not a de Polignac number, because 165377601 - 2⁷ = 165377473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165377603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9187636 + ... + 9187653.

Almost surely, 2^165377601 is an apocalyptic number.

It is an amenable number.

165377601 is a deficient number, since it is larger than the sum of its proper divisors (73501169).

165377601 is a wasteful number, since it uses less digits than its factorization.

165377601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18375295 (or 18375292 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 165377601 is about 12859.9222781477. The cubic root of 165377601 is about 548.8987341465.

The spelling of 165377601 in words is "one hundred sixty-five million, three hundred seventy-seven thousand, six hundred one".