640266466635 has 24 divisors (see below), whose sum is σ = 1109828163600. Its totient is φ = 341465308992.

The previous prime is 640266466601. The next prime is 640266466657. The reversal of 640266466635 is 536664662046.

It is not a de Polignac number, because 640266466635 - 2⁸ = 640266466379 is a prime.

It is a super-2 number, since 2×640266466635² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1467657 + ... + 1853253.

It is an arithmetic number, because the mean of its divisors is an integer number (46242840150).

Almost surely, 2^640266466635 is an apocalyptic number.

640266466635 is a deficient number, since it is larger than the sum of its proper divisors (469561696965).

640266466635 is a wasteful number, since it uses less digits than its factorization.

640266466635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422507 (or 422504 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 54.

The spelling of 640266466635 in words is "six hundred forty billion, two hundred sixty-six million, four hundred sixty-six thousand, six hundred thirty-five".