669059664 has 160 divisors (see below), whose sum is σ = 2173194240. Its totient is φ = 172647936.

The previous prime is 669059659. The next prime is 669059693. The reversal of 669059664 is 466950966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203667 + ... + 206925.

It is an arithmetic number, because the mean of its divisors is an integer number (13582464).

Almost surely, 2^669059664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669059664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086597120).

669059664 is an abundant number, since it is smaller than the sum of its proper divisors (1504134576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669059664 is a wasteful number, since it uses less digits than its factorization.

669059664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337 (or 3331 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 51.

The square root of 669059664 is about 25866.1876587950. The cubic root of 669059664 is about 874.6244544599.

The spelling of 669059664 in words is "six hundred sixty-nine million, fifty-nine thousand, six hundred sixty-four".