6690686887 has 8 divisors (see below), whose sum is σ = 6706301040. Its totient is φ = 6675092160.

The previous prime is 6690686869. The next prime is 6690686939. The reversal of 6690686887 is 7886860966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6690686887 - 2⁷ = 6690686759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690686687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850689 + ... + 858517.

It is an arithmetic number, because the mean of its divisors is an integer number (838287630).

Almost surely, 2^6690686887 is an apocalyptic number.

6690686887 is a deficient number, since it is larger than the sum of its proper divisors (15614153).

6690686887 is a wasteful number, since it uses less digits than its factorization.

6690686887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9713.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The square root of 6690686887 is about 81796.6190438211. The cubic root of 6690686887 is about 1884.3297377062.

The spelling of 6690686887 in words is "six billion, six hundred ninety million, six hundred eighty-six thousand, eight hundred eighty-seven".