669311856 has 160 divisors (see below), whose sum is σ = 1987729920. Its totient is φ = 215502336.

The previous prime is 669311849. The next prime is 669311861. The reversal of 669311856 is 658113966.

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, 2544781 + ... + 2545043.

It is an arithmetic number, because the mean of its divisors is an integer number (12423312).

Almost surely, 2^669311856 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 669311856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993864960).

669311856 is an abundant number, since it is smaller than the sum of its proper divisors (1318418064).

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

669311856 is a wasteful number, since it uses less digits than its factorization.

669311856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 448 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 669311856 is about 25871.0621351347. The cubic root of 669311856 is about 874.7343328430.

The spelling of 669311856 in words is "six hundred sixty-nine million, three hundred eleven thousand, eight hundred fifty-six".