640174136735 has 16 divisors (see below), whose sum is σ = 899366594112. Its totient is φ = 428269804800.

The previous prime is 640174136729. The next prime is 640174136747. The reversal of 640174136735 is 537631471046.

It is not a de Polignac number, because 640174136735 - 2⁸ = 640174136479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640174136735.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223055756 + ... + 223058625.

It is an arithmetic number, because the mean of its divisors is an integer number (56210412132).

Almost surely, 2^640174136735 is an apocalyptic number.

640174136735 is a deficient number, since it is larger than the sum of its proper divisors (259192457377).

640174136735 is a wasteful number, since it uses less digits than its factorization.

640174136735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446114434.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 640174136735 in words is "six hundred forty billion, one hundred seventy-four million, one hundred thirty-six thousand, seven hundred thirty-five".