640976297635 has 16 divisors (see below), whose sum is σ = 787960333440. Its totient is φ = 500256092160.

The previous prime is 640976297569. The next prime is 640976297651. The reversal of 640976297635 is 536792679046.

640976297635 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 640976297635 - 2¹¹ = 640976295587 is a prime.

It is a super-2 number, since 2×640976297635² (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 15 ways as a sum of consecutive naturals, for example, 9847126 + ... + 9912004.

It is an arithmetic number, because the mean of its divisors is an integer number (49247520840).

Almost surely, 2^640976297635 is an apocalyptic number.

640976297635 is a deficient number, since it is larger than the sum of its proper divisors (146984035805).

640976297635 is a wasteful number, since it uses less digits than its factorization.

640976297635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113118.

The product of its (nonzero) digits is 102876480, while the sum is 64.

The spelling of 640976297635 in words is "six hundred forty billion, nine hundred seventy-six million, two hundred ninety-seven thousand, six hundred thirty-five".