669641686 has 8 divisors (see below), whose sum is σ = 1147957200. Its totient is φ = 286989288.

The previous prime is 669641671. The next prime is 669641701. The reversal of 669641686 is 686146966.

It is an interprime number because it is at equal distance from previous prime (669641671) and next prime (669641701).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23915761 + ... + 23915788.

It is an arithmetic number, because the mean of its divisors is an integer number (143494650).

Almost surely, 2^669641686 is an apocalyptic number.

669641686 is a deficient number, since it is larger than the sum of its proper divisors (478315514).

669641686 is a wasteful number, since it uses less digits than its factorization.

669641686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47831558.

The product of its digits is 2239488, while the sum is 52.

The square root of 669641686 is about 25877.4358466986. The cubic root of 669641686 is about 874.8779959418.

The spelling of 669641686 in words is "six hundred sixty-nine million, six hundred forty-one thousand, six hundred eighty-six".