689407666 has 8 divisors (see below), whose sum is σ = 1088538480. Its totient is φ = 326561508.

The previous prime is 689407639. The next prime is 689407709. The reversal of 689407666 is 666704986.

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

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, 9071116 + ... + 9071191.

It is an arithmetic number, because the mean of its divisors is an integer number (136067310).

Almost surely, 2^689407666 is an apocalyptic number.

689407666 is a deficient number, since it is larger than the sum of its proper divisors (399130814).

689407666 is a wasteful number, since it uses less digits than its factorization.

689407666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18142328.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 689407666 is about 26256.5737673444. The cubic root of 689407666 is about 883.4026603078.

The spelling of 689407666 in words is "six hundred eighty-nine million, four hundred seven thousand, six hundred sixty-six".