6631640775 has 48 divisors (see below), whose sum is σ = 12823782400. Its totient is φ = 3350717280.

The previous prime is 6631640767. The next prime is 6631640809. The reversal of 6631640775 is 5770461366.

6631640775 is a `hidden beast` number, since 6 + 631 + 6 + 4 + 0 + 7 + 7 + 5 = 666.

It is not a de Polignac number, because 6631640775 - 2³ = 6631640767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6631640775.

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, 245719 + ... + 271368.

Almost surely, 2^6631640775 is an apocalyptic number.

6631640775 is a deficient number, since it is larger than the sum of its proper divisors (6192141625).

6631640775 is a wasteful number, since it uses less digits than its factorization.

6631640775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517125 (or 517114 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 6631640775 is about 81434.8867193907. The cubic root of 6631640775 is about 1878.7702058775.

The spelling of 6631640775 in words is "six billion, six hundred thirty-one million, six hundred forty thousand, seven hundred seventy-five".