6657457515639 has 96 divisors (see below), whose sum is σ = 10864004000256. Its totient is φ = 3608852163840.

The previous prime is 6657457515619. The next prime is 6657457515697. The reversal of 6657457515639 is 9365157547566.

It is not a de Polignac number, because 6657457515639 - 2²⁸ = 6657189080183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657457515619) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 211124304 + ... + 211155834.

It is an arithmetic number, because the mean of its divisors is an integer number (113166708336).

Almost surely, 2^{6657457515639} is an apocalyptic number.

6657457515639 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

6657457515639 is a deficient number, since it is larger than the sum of its proper divisors (4206546484617).

6657457515639 is a wasteful number, since it uses less digits than its factorization.

6657457515639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32085 (or 32078 counting only the distinct ones).

The product of its digits is 714420000, while the sum is 69.

The spelling of 6657457515639 in words is "six trillion, six hundred fifty-seven billion, four hundred fifty-seven million, five hundred fifteen thousand, six hundred thirty-nine".