664683787497 has 8 divisors (see below), whose sum is σ = 886251025440. Its totient is φ = 443119537280.

The previous prime is 664683787447. The next prime is 664683787511. The reversal of 664683787497 is 794787386466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664683787497 - 2¹⁵ = 664683754729 is a prime.

It is a super-2 number, since 2×664683787497² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664683787447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162504 + ... + 1164377.

It is an arithmetic number, because the mean of its divisors is an integer number (110781378180).

Almost surely, 2^664683787497 is an apocalyptic number.

It is an amenable number.

664683787497 is a deficient number, since it is larger than the sum of its proper divisors (221567237943).

664683787497 is a wasteful number, since it uses less digits than its factorization.

664683787497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493863.

The product of its digits is 2048385024, while the sum is 75.

The spelling of 664683787497 in words is "six hundred sixty-four billion, six hundred eighty-three million, seven hundred eighty-seven thousand, four hundred ninety-seven".