6631887679 has 4 divisors (see below), whose sum is σ = 6634266640. Its totient is φ = 6629508720.

The previous prime is 6631887667. The next prime is 6631887727. The reversal of 6631887679 is 9767881366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6631887679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6631885679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185294 + ... + 1190875.

It is an arithmetic number, because the mean of its divisors is an integer number (1658566660).

Almost surely, 2^6631887679 is an apocalyptic number.

6631887679 is a deficient number, since it is larger than the sum of its proper divisors (2378961).

6631887679 is a wasteful number, since it uses less digits than its factorization.

6631887679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378960.

The product of its digits is 18289152, while the sum is 61.

The square root of 6631887679 is about 81436.4026649016. The cubic root of 6631887679 is about 1878.7935218832.

The spelling of 6631887679 in words is "six billion, six hundred thirty-one million, eight hundred eighty-seven thousand, six hundred seventy-nine".