669764013057 has 54 divisors (see below), whose sum is σ = 1035534821958. Its totient is φ = 415702658304.

The previous prime is 669764013031. The next prime is 669764013067. The reversal of 669764013057 is 750310467966.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 306455245056 + 363308768001 = 553584^2 + 602751^2 .

It is not a de Polignac number, because 669764013057 - 2²⁸ = 669495577601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669764012994 and 669764013012.

It is not an unprimeable number, because it can be changed into a prime (669764013007) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1103400048 + ... + 1103400654.

It is an arithmetic number, because the mean of its divisors is an integer number (19176570777).

Almost surely, 2^669764013057 is an apocalyptic number.

It is an amenable number.

669764013057 is a deficient number, since it is larger than the sum of its proper divisors (365770808901).

669764013057 is an equidigital number, since it uses as much as digits as its factorization.

669764013057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 669764013057 in words is "six hundred sixty-nine billion, seven hundred sixty-four million, thirteen thousand, fifty-seven".