623664165 has 16 divisors (see below), whose sum is σ = 999489600. Its totient is φ = 332078592.

The previous prime is 623664163. The next prime is 623664179. The reversal of 623664165 is 561466326.

It is not a de Polignac number, because 623664165 - 2¹ = 623664163 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623664163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24300 + ... + 42869.

It is an arithmetic number, because the mean of its divisors is an integer number (62468100).

Almost surely, 2^623664165 is an apocalyptic number.

It is an amenable number.

623664165 is a deficient number, since it is larger than the sum of its proper divisors (375825435).

623664165 is a wasteful number, since it uses less digits than its factorization.

623664165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67796.

The product of its digits is 155520, while the sum is 39.

The square root of 623664165 is about 24973.2690090825. The cubic root of 623664165 is about 854.3784066573.

The spelling of 623664165 in words is "six hundred twenty-three million, six hundred sixty-four thousand, one hundred sixty-five".