6669967656 has 64 divisors (see below), whose sum is σ = 18198198720. Its totient is φ = 2020382720.

The previous prime is 6669967649. The next prime is 6669967721. The reversal of 6669967656 is 6567699666.

It is a super-2 number, since 2×6669967656² = 88976937064172268672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 1088056 + ... + 1094168.

It is an arithmetic number, because the mean of its divisors is an integer number (284346855).

Almost surely, 2^6669967656 is an apocalyptic number.

6669967656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6669967656 is an abundant number, since it is smaller than the sum of its proper divisors (11528231064).

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

6669967656 is a wasteful number, since it uses less digits than its factorization.

6669967656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10266 (or 10262 counting only the distinct ones).

The product of its digits is 132269760, while the sum is 66.

The square root of 6669967656 is about 81669.8699398989. The cubic root of 6669967656 is about 1882.3826414954.

The spelling of 6669967656 in words is "six billion, six hundred sixty-nine million, nine hundred sixty-seven thousand, six hundred fifty-six".