6695991866 has 4 divisors (see below), whose sum is σ = 10043987802. Its totient is φ = 3347995932.

The previous prime is 6695991853. The next prime is 6695991901. The reversal of 6695991866 is 6681995966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4432230625 + 2263761241 = 66575^2 + 47579^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1673997965 + ... + 1673997968.

Almost surely, 2^6695991866 is an apocalyptic number.

6695991866 is a deficient number, since it is larger than the sum of its proper divisors (3347995936).

6695991866 is a wasteful number, since it uses less digits than its factorization.

6695991866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347995935.

The product of its digits is 37791360, while the sum is 65.

The square root of 6695991866 is about 81829.0404807486. The cubic root of 6695991866 is about 1884.8276282329.

The spelling of 6695991866 in words is "six billion, six hundred ninety-five million, nine hundred ninety-one thousand, eight hundred sixty-six".