6667921856 has 14 divisors (see below), whose sum is σ = 13231657560. Its totient is φ = 3333960896.

The previous prime is 6667921837. The next prime is 6667921859. The reversal of 6667921856 is 6581297666.

It is a happy number.

It is a super-2 number, since 2×6667921856² = 88922363755444969472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6667921859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52093076 + ... + 52093203.

Almost surely, 2^6667921856 is an apocalyptic number.

It is an amenable number.

6667921856 is a deficient number, since it is larger than the sum of its proper divisors (6563735704).

6667921856 is a wasteful number, since it uses less digits than its factorization.

6667921856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104186291 (or 104186281 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The square root of 6667921856 is about 81657.3441645024. The cubic root of 6667921856 is about 1882.1901681884.

The spelling of 6667921856 in words is "six billion, six hundred sixty-seven million, nine hundred twenty-one thousand, eight hundred fifty-six".