664788713675 has 6 divisors (see below), whose sum is σ = 824338004988. Its totient is φ = 531830970920.

The previous prime is 664788713671. The next prime is 664788713683. The reversal of 664788713675 is 576317887466.

664788713675 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664788713675 - 2² = 664788713671 is a prime.

It is a super-2 number, since 2×664788713675² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664788713671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13295774249 + ... + 13295774298.

It is an arithmetic number, because the mean of its divisors is an integer number (137389667498).

Almost surely, 2^664788713675 is an apocalyptic number.

664788713675 is a deficient number, since it is larger than the sum of its proper divisors (159549291313).

664788713675 is a wasteful number, since it uses less digits than its factorization.

664788713675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26591548557 (or 26591548552 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 68.

The spelling of 664788713675 in words is "six hundred sixty-four billion, seven hundred eighty-eight million, seven hundred thirteen thousand, six hundred seventy-five".