6690688969 has 4 divisors (see below), whose sum is σ = 6693204096. Its totient is φ = 6688173844.

The previous prime is 6690688957. The next prime is 6690688973. The reversal of 6690688969 is 9698860966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6690688969 - 2⁷ = 6690688841 is a prime.

It is a super-2 number, since 2×6690688969² = 89530637759796565922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690688909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253569 + ... + 1258894.

It is an arithmetic number, because the mean of its divisors is an integer number (1673301024).

Almost surely, 2^6690688969 is an apocalyptic number.

It is an amenable number.

6690688969 is a deficient number, since it is larger than the sum of its proper divisors (2515127).

6690688969 is a wasteful number, since it uses less digits than its factorization.

6690688969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515126.

The product of its (nonzero) digits is 60466176, while the sum is 67.

The square root of 6690688969 is about 81796.6317705075. The cubic root of 6690688969 is about 1884.3299331607.

The spelling of 6690688969 in words is "six billion, six hundred ninety million, six hundred eighty-eight thousand, nine hundred sixty-nine".