669992685 has 32 divisors (see below), whose sum is σ = 1100881152. Its totient is φ = 347742720.

The previous prime is 669992647. The next prime is 669992689. The reversal of 669992685 is 586299966.

It is not a de Polignac number, because 669992685 - 2⁶ = 669992621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669992689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298387 + ... + 300623.

It is an arithmetic number, because the mean of its divisors is an integer number (34402536).

Almost surely, 2^669992685 is an apocalyptic number.

It is an amenable number.

669992685 is a deficient number, since it is larger than the sum of its proper divisors (430888467).

669992685 is a wasteful number, since it uses less digits than its factorization.

669992685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773.

The product of its digits is 12597120, while the sum is 60.

The square root of 669992685 is about 25884.2169091514. The cubic root of 669992685 is about 875.0308277574.

The spelling of 669992685 in words is "six hundred sixty-nine million, nine hundred ninety-two thousand, six hundred eighty-five".