6699421128976 has 15 divisors (see below), whose sum is σ = 12980148496933. Its totient is φ = 3349705387840.

The previous prime is 6699421128949. The next prime is 6699421128989. The reversal of 6699421128976 is 6798211249966.

It is a happy number.

The square root of 6699421128976 is 2588324.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2053844399376 + 4645576729600 = 1433124^2 + 2155360^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10029756 + ... + 10676836.

Almost surely, 2^{6699421128976} is an apocalyptic number.

6699421128976 is the 2588324-th square number.

It is an amenable number.

6699421128976 is a deficient number, since it is larger than the sum of its proper divisors (6280727367957).

6699421128976 is an frugal number, since it uses more digits than its factorization.

6699421128976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294170 (or 647083 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 70.

The spelling of 6699421128976 in words is "six trillion, six hundred ninety-nine billion, four hundred twenty-one million, one hundred twenty-eight thousand, nine hundred seventy-six".