669710564776 has 72 divisors (see below), whose sum is σ = 1406671870590. Its totient is φ = 298587569280.

The previous prime is 669710564741. The next prime is 669710564827. The reversal of 669710564776 is 677465017966.

It can be written as a sum of positive squares in 3 ways, for example, as 171520222500 + 498190342276 = 414150^2 + 705826^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 185359546 + ... + 185363158.

Almost surely, 2^669710564776 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 669710564776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703335935295).

669710564776 is an abundant number, since it is smaller than the sum of its proper divisors (736961305814).

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

669710564776 is an equidigital number, since it uses as much as digits as its factorization.

669710564776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307 (or 3679 counting only the distinct ones).

The product of its (nonzero) digits is 80015040, while the sum is 64.

The spelling of 669710564776 in words is "six hundred sixty-nine billion, seven hundred ten million, five hundred sixty-four thousand, seven hundred seventy-six".