6662156666 has 48 divisors (see below), whose sum is σ = 11306421504. Its totient is φ = 2940168000.

The previous prime is 6662156621. The next prime is 6662156687. The reversal of 6662156666 is 6666512666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2211101 + ... + 2214111.

It is an arithmetic number, because the mean of its divisors is an integer number (235550448).

Almost surely, 2^6662156666 is an apocalyptic number.

6662156666 is a deficient number, since it is larger than the sum of its proper divisors (4644264838).

6662156666 is a wasteful number, since it uses less digits than its factorization.

6662156666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299 (or 3288 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 50.

The square root of 6662156666 is about 81622.0354193645. The cubic root of 6662156666 is about 1881.6475547104.

The spelling of 6662156666 in words is "six billion, six hundred sixty-two million, one hundred fifty-six thousand, six hundred sixty-six".