640104101635 has 64 divisors (see below), whose sum is σ = 817609605120. Its totient is φ = 480442959360.

The previous prime is 640104101573. The next prime is 640104101639. The reversal of 640104101635 is 536101401046.

It is not a de Polignac number, because 640104101635 - 2³⁷ = 502665148163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640104101597 and 640104101606.

It is not an unprimeable number, because it can be changed into a prime (640104101639) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 519986470 + ... + 519987700.

It is an arithmetic number, because the mean of its divisors is an integer number (12775150080).

Almost surely, 2^640104101635 is an apocalyptic number.

640104101635 is a deficient number, since it is larger than the sum of its proper divisors (177505503485).

640104101635 is a wasteful number, since it uses less digits than its factorization.

640104101635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 640104101635 in words is "six hundred forty billion, one hundred four million, one hundred one thousand, six hundred thirty-five".