664540627635 has 96 divisors (see below), whose sum is σ = 1224562240512. Its totient is φ = 332226339840.

The previous prime is 664540627613. The next prime is 664540627693. The reversal of 664540627635 is 536726045466.

664540627635 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 4 + 0 + 627 + 6 + 3 + 5 = 666.

It is not a de Polignac number, because 664540627635 - 2²¹ = 664538530483 is a prime.

It is a super-2 number, since 2×664540627635² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 366945880 + ... + 366947690.

It is an arithmetic number, because the mean of its divisors is an integer number (12755856672).

Almost surely, 2^664540627635 is an apocalyptic number.

664540627635 is a deficient number, since it is larger than the sum of its proper divisors (560021612877).

664540627635 is a wasteful number, since it uses less digits than its factorization.

664540627635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513 (or 3510 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 54.

The spelling of 664540627635 in words is "six hundred sixty-four billion, five hundred forty million, six hundred twenty-seven thousand, six hundred thirty-five".