664463612044731 has 4 divisors (see below), whose sum is σ = 885951482726312. Its totient is φ = 442975741363152.

The previous prime is 664463612044679. The next prime is 664463612044831. The reversal of 664463612044731 is 137440216364466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 664463612044731 - 2¹⁷ = 664463611913659 is a prime.

It is a super-2 number, since 2×664463612044731² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664463612044831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110743935340786 + ... + 110743935340791.

It is an arithmetic number, because the mean of its divisors is an integer number (221487870681578).

Almost surely, 2^{664463612044731} is an apocalyptic number.

664463612044731 is a deficient number, since it is larger than the sum of its proper divisors (221487870681581).

664463612044731 is a wasteful number, since it uses less digits than its factorization.

664463612044731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221487870681580.

The product of its (nonzero) digits is 41803776, while the sum is 57.

The spelling of 664463612044731 in words is "six hundred sixty-four trillion, four hundred sixty-three billion, six hundred twelve million, forty-four thousand, seven hundred thirty-one".