666623365023 has 64 divisors (see below), whose sum is σ = 1213798763520. Its totient is φ = 314688460800.

The previous prime is 666623365019. The next prime is 666623365043. The reversal of 666623365023 is 320563326666.

It is not a de Polignac number, because 666623365023 - 2² = 666623365019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666623365013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2812908 + ... + 3040673.

It is an arithmetic number, because the mean of its divisors is an integer number (18965605680).

Almost surely, 2^666623365023 is an apocalyptic number.

666623365023 is a deficient number, since it is larger than the sum of its proper divisors (547175398497).

666623365023 is a wasteful number, since it uses less digits than its factorization.

666623365023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5853648.

The product of its (nonzero) digits is 4199040, while the sum is 48.

The spelling of 666623365023 in words is "six hundred sixty-six billion, six hundred twenty-three million, three hundred sixty-five thousand, twenty-three".