6466993680 has 80 divisors (see below), whose sum is σ = 22911640704. Its totient is φ = 1478169600.

The previous prime is 6466993661. The next prime is 6466993703. The reversal of 6466993680 is 863996646.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 6466993680.

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, 1923021 + ... + 1926380.

Almost surely, 2^6466993680 is an apocalyptic number.

6466993680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6466993680 is an abundant number, since it is smaller than the sum of its proper divisors (16444647024).

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

6466993680 is a wasteful number, since it uses less digits than its factorization.

6466993680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849424 (or 3849418 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 57.

The square root of 6466993680 is about 80417.6204572107. The cubic root of 6466993680 is about 1863.0913329176.

The spelling of 6466993680 in words is "six billion, four hundred sixty-six million, nine hundred ninety-three thousand, six hundred eighty".