6519938172664 has 32 divisors (see below), whose sum is σ = 13988523427200. Its totient is φ = 2790813748320.

The previous prime is 6519938172661. The next prime is 6519938172677. The reversal of 6519938172664 is 4662718399156.

It is a super-2 number, since 2×6519938172664² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6519938172664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6519938172661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71734774 + ... + 71825605.

It is an arithmetic number, because the mean of its divisors is an integer number (437141357100).

Almost surely, 2^{6519938172664} is an apocalyptic number.

It is an amenable number.

6519938172664 is an abundant number, since it is smaller than the sum of its proper divisors (7468585254536).

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

6519938172664 is a wasteful number, since it uses less digits than its factorization.

6519938172664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143561203 (or 143561199 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 67.

The spelling of 6519938172664 in words is "six trillion, five hundred nineteen billion, nine hundred thirty-eight million, one hundred seventy-two thousand, six hundred sixty-four".