669655046757636 has 81 divisors (see below), whose sum is σ = 1694494950425823. Its totient is φ = 222987054090240.

The previous prime is 669655046757623. The next prime is 669655046757637. The reversal of 669655046757636 is 636757640556966.

The square root of 669655046757636 is 25877694.

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

669655046757636 is a `hidden beast` number, since 6 + 6 + 9 + 6 + 5 + 5 + 0 + 4 + 6 + 7 + 576 + 36 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7249523940036 + 662405522817600 = 2692494^2 + 25737240^2 .

It is not an unprimeable number, because it can be changed into a prime (669655046757637) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 218770023546 + ... + 218770026606.

Almost surely, 2^{669655046757636} is an apocalyptic number.

669655046757636 is the 25877694-th square number.

It is an amenable number.

669655046757636 is an abundant number, since it is smaller than the sum of its proper divisors (1024839903668187).

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

669655046757636 is an frugal number, since it uses more digits than its factorization.

669655046757636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8950 (or 4475 counting only the distinct ones).

The product of its (nonzero) digits is 30862944000, while the sum is 81.

The spelling of 669655046757636 in words is "six hundred sixty-nine trillion, six hundred fifty-five billion, forty-six million, seven hundred fifty-seven thousand, six hundred thirty-six".