646627656415 has 32 divisors (see below), whose sum is σ = 836815859712. Its totient is φ = 476839440000.

The previous prime is 646627656379. The next prime is 646627656419. The reversal of 646627656415 is 514656726646.

It is not a de Polignac number, because 646627656415 - 2¹⁷ = 646627525343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646627656415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646627656419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275042490 + ... + 275044840.

It is an arithmetic number, because the mean of its divisors is an integer number (26150495616).

Almost surely, 2^646627656415 is an apocalyptic number.

646627656415 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

646627656415 is a deficient number, since it is larger than the sum of its proper divisors (190188203297).

646627656415 is a wasteful number, since it uses less digits than its factorization.

646627656415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6511.

The product of its digits is 43545600, while the sum is 58.

The spelling of 646627656415 in words is "six hundred forty-six billion, six hundred twenty-seven million, six hundred fifty-six thousand, four hundred fifteen".