669745776 has 80 divisors (see below), whose sum is σ = 1981889024. Its totient is φ = 190916352.

The previous prime is 669745771. The next prime is 669745859. The reversal of 669745776 is 677547966.

669745776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669745771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161586 + ... + 165678.

Almost surely, 2^669745776 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 669745776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990944512).

669745776 is an abundant number, since it is smaller than the sum of its proper divisors (1312143248).

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

669745776 is a wasteful number, since it uses less digits than its factorization.

669745776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4598 (or 4592 counting only the distinct ones).

The product of its digits is 13335840, while the sum is 57.

The square root of 669745776 is about 25879.4469801810. The cubic root of 669745776 is about 874.9233243288.

The spelling of 669745776 in words is "six hundred sixty-nine million, seven hundred forty-five thousand, seven hundred seventy-six".