6815139866631 has 32 divisors (see below), whose sum is σ = 10262425275840. Its totient is φ = 4468767667200.

The previous prime is 6815139866621. The next prime is 6815139866659. The reversal of 6815139866631 is 1366689315186.

It is not a de Polignac number, because 6815139866631 - 2¹⁴ = 6815139850247 is a prime.

It is a super-2 number, since 2×6815139866631² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6815139866621) 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, 51519631 + ... + 51651743.

It is an arithmetic number, because the mean of its divisors is an integer number (320700789870).

Almost surely, 2^{6815139866631} is an apocalyptic number.

6815139866631 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6815139866631 is a deficient number, since it is larger than the sum of its proper divisors (3447285409209).

6815139866631 is a wasteful number, since it uses less digits than its factorization.

6815139866631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163504 (or 163498 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The spelling of 6815139866631 in words is "six trillion, eight hundred fifteen billion, one hundred thirty-nine million, eight hundred sixty-six thousand, six hundred thirty-one".