640311126615 has 48 divisors (see below), whose sum is σ = 1130686667136. Its totient is φ = 335120947200.

The previous prime is 640311126557. The next prime is 640311126641. The reversal of 640311126615 is 516621113046.

640311126615 is a `hidden beast` number, since 6 + 4 + 0 + 3 + 1 + 11 + 26 + 615 = 666.

It is not a de Polignac number, because 640311126615 - 2⁸ = 640311126359 is a prime.

It is a super-2 number, since 2×640311126615² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640311126615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 912487 + ... + 1453703.

It is an arithmetic number, because the mean of its divisors is an integer number (23555972232).

Almost surely, 2^640311126615 is an apocalyptic number.

640311126615 is a deficient number, since it is larger than the sum of its proper divisors (490375540521).

640311126615 is a wasteful number, since it uses less digits than its factorization.

640311126615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541720 (or 541717 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 640311126615 in words is "six hundred forty billion, three hundred eleven million, one hundred twenty-six thousand, six hundred fifteen".