6666766672 has 10 divisors (see below), whose sum is σ = 12916860458. Its totient is φ = 3333383328.

The previous prime is 6666766669. The next prime is 6666766681. The reversal of 6666766672 is 2766676666.

It can be written as a sum of positive squares in only one way, i.e., 3425058576 + 3241708096 = 58524^2 + 56936^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208336443 + ... + 208336474.

Almost surely, 2^6666766672 is an apocalyptic number.

It is an amenable number.

6666766672 is a deficient number, since it is larger than the sum of its proper divisors (6250093786).

6666766672 is a wasteful number, since it uses less digits than its factorization.

6666766672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416672925 (or 416672919 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 58.

The square root of 6666766672 is about 81650.2704955715. The cubic root of 6666766672 is about 1882.0814685772.

The spelling of 6666766672 in words is "six billion, six hundred sixty-six million, seven hundred sixty-six thousand, six hundred seventy-two".