669516697600 has 117 divisors (see below), whose sum is σ = 1660848254247. Its totient is φ = 267701944320.

The previous prime is 669516697589. The next prime is 669516697627. The reversal of 669516697600 is 6796615966.

The square root of 669516697600 is 818240.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 29926232064 + 639590465536 = 172992^2 + 799744^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 261835522 + ... + 261838078.

Almost surely, 2^669516697600 is an apocalyptic number.

669516697600 is the 818240-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669516697600

669516697600 is an abundant number, since it is smaller than the sum of its proper divisors (991331556647).

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

669516697600 is an frugal number, since it uses more digits than its factorization.

669516697600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5148 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 61.

The spelling of 669516697600 in words is "six hundred sixty-nine billion, five hundred sixteen million, six hundred ninety-seven thousand, six hundred".