165672405 has 32 divisors (see below), whose sum is σ = 298581120. Its totient is φ = 87143040.

The previous prime is 165672391. The next prime is 165672433. The reversal of 165672405 is 504276561.

It is a happy number.

It is not a de Polignac number, because 165672405 - 2⁵ = 165672373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165672405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1450 + ... + 18260.

It is an arithmetic number, because the mean of its divisors is an integer number (9330660).

Almost surely, 2^165672405 is an apocalyptic number.

165672405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165672405 is a deficient number, since it is larger than the sum of its proper divisors (132908715).

165672405 is a wasteful number, since it uses less digits than its factorization.

165672405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16898 (or 16892 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 165672405 is about 12871.3792967187. The cubic root of 165672405 is about 549.2246982511.

The spelling of 165672405 in words is "one hundred sixty-five million, six hundred seventy-two thousand, four hundred five".