6657457515640 has 32 divisors (see below), whose sum is σ = 15097226503680. Its totient is φ = 2642014634112.

The previous prime is 6657457515619. The next prime is 6657457515697. The reversal of 6657457515640 is 465157547566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655256487 + ... + 655266646.

It is an arithmetic number, because the mean of its divisors is an integer number (471788328240).

Almost surely, 2^{6657457515640} is an apocalyptic number.

It is an amenable number.

6657457515640 is an abundant number, since it is smaller than the sum of its proper divisors (8439768988040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6657457515640 is a wasteful number, since it uses less digits than its factorization.

6657457515640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310523271 (or 1310523267 counting only the distinct ones).

The product of its (nonzero) digits is 105840000, while the sum is 61.

The spelling of 6657457515640 in words is "six trillion, six hundred fifty-seven billion, four hundred fifty-seven million, five hundred fifteen thousand, six hundred forty".