165672401 has 16 divisors (see below), whose sum is σ = 176179200. Its totient is φ = 155563200.

The previous prime is 165672391. The next prime is 165672433. The reversal of 165672401 is 104276561.

It is a cyclic number.

It is not a de Polignac number, because 165672401 - 2¹⁴ = 165656017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165672461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148835 + ... + 149943.

It is an arithmetic number, because the mean of its divisors is an integer number (11011200).

Almost surely, 2^165672401 is an apocalyptic number.

It is an amenable number.

165672401 is a deficient number, since it is larger than the sum of its proper divisors (10506799).

165672401 is a wasteful number, since it uses less digits than its factorization.

165672401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 165672401 is about 12871.3791413352. The cubic root of 165672401 is about 549.2246938310.

The spelling of 165672401 in words is "one hundred sixty-five million, six hundred seventy-two thousand, four hundred one".