164520765 has 12 divisors (see below), whose sum is σ = 285169404. Its totient is φ = 87744384.

The previous prime is 164520761. The next prime is 164520773. The reversal of 164520765 is 567025461.

It is a happy number.

164520765 is a `hidden beast` number, since 1 + 64 + 520 + 76 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 127103076 + 37417689 = 11274^2 + 6117^2 .

It is not a de Polignac number, because 164520765 - 2² = 164520761 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164520761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1827964 + ... + 1828053.

It is an arithmetic number, because the mean of its divisors is an integer number (23764117).

Almost surely, 2^164520765 is an apocalyptic number.

164520765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164520765 is a deficient number, since it is larger than the sum of its proper divisors (120648639).

164520765 is a wasteful number, since it uses less digits than its factorization.

164520765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656028 (or 3656025 counting only the distinct ones).

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

The square root of 164520765 is about 12826.5648168167. The cubic root of 164520765 is about 547.9491279343.

The spelling of 164520765 in words is "one hundred sixty-four million, five hundred twenty thousand, seven hundred sixty-five".