6515180664 has 16 divisors (see below), whose sum is σ = 16287951720. Its totient is φ = 2171726880.

The previous prime is 6515180663. The next prime is 6515180671. The reversal of 6515180664 is 4660815156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6515180663) 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, 135732907 + ... + 135732954.

Almost surely, 2^6515180664 is an apocalyptic number.

It is an amenable number.

6515180664 is an abundant number, since it is smaller than the sum of its proper divisors (9772771056).

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

6515180664 is a wasteful number, since it uses less digits than its factorization.

6515180664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271465870 (or 271465866 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 6515180664 is about 80716.6690591231. The cubic root of 6515180664 is about 1867.7073205568.

The spelling of 6515180664 in words is "six billion, five hundred fifteen million, one hundred eighty thousand, six hundred sixty-four".