646040761023 has 64 divisors (see below), whose sum is σ = 1060206080000. Its totient is φ = 348809563872.

The previous prime is 646040760979. The next prime is 646040761039. The reversal of 646040761023 is 320167040646.

It is a happy number.

It is not a de Polignac number, because 646040761023 - 2²⁰ = 646039712447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646040761423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7366236 + ... + 7453422.

It is an arithmetic number, because the mean of its divisors is an integer number (16565720000).

Almost surely, 2^646040761023 is an apocalyptic number.

646040761023 is a deficient number, since it is larger than the sum of its proper divisors (414165318977).

646040761023 is a wasteful number, since it uses less digits than its factorization.

646040761023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87609 (or 87595 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The spelling of 646040761023 in words is "six hundred forty-six billion, forty million, seven hundred sixty-one thousand, twenty-three".