6581611672 has 64 divisors (see below), whose sum is σ = 12713247360. Its totient is φ = 3193344000.

The previous prime is 6581611651. The next prime is 6581611681. The reversal of 6581611672 is 2761161856.

It is a super-2 number, since 2×6581611672² = 86635224402013271168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14214913 + ... + 14215375.

It is an arithmetic number, because the mean of its divisors is an integer number (198644490).

Almost surely, 2^6581611672 is an apocalyptic number.

It is an amenable number.

6581611672 is a deficient number, since it is larger than the sum of its proper divisors (6131635688).

6581611672 is a wasteful number, since it uses less digits than its factorization.

6581611672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 880 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 6581611672 is about 81127.1327731974. The cubic root of 6581611672 is about 1874.0337940538.

The spelling of 6581611672 in words is "six billion, five hundred eighty-one million, six hundred eleven thousand, six hundred seventy-two".