6666697637 has 24 divisors (see below), whose sum is σ = 7360651200. Its totient is φ = 6020898048.

The previous prime is 6666697633. The next prime is 6666697649. The reversal of 6666697637 is 7367966666.

It is a happy number.

It is not a de Polignac number, because 6666697637 - 2² = 6666697633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6666697637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666697633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3547064 + ... + 3548942.

It is an arithmetic number, because the mean of its divisors is an integer number (306693800).

Almost surely, 2^6666697637 is an apocalyptic number.

It is an amenable number.

6666697637 is a deficient number, since it is larger than the sum of its proper divisors (693953563).

6666697637 is a wasteful number, since it uses less digits than its factorization.

6666697637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297 (or 2274 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 62.

The square root of 6666697637 is about 81649.8477463369. The cubic root of 6666697637 is about 1882.0749721775.

The spelling of 6666697637 in words is "six billion, six hundred sixty-six million, six hundred ninety-seven thousand, six hundred thirty-seven".