668015251684 has 81 divisors (see below), whose sum is σ = 1301745623241. Its totient is φ = 299728323840.

The previous prime is 668015251681. The next prime is 668015251699. The reversal of 668015251684 is 486152510866.

The square root of 668015251684 is 817322.

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

668015251684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 299964336100 + 368050915584 = 547690^2 + 606672^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668015251681) 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, 1744164957 + ... + 1744165339.

Almost surely, 2^668015251684 is an apocalyptic number.

668015251684 is the 817322-nd square number.

It is an amenable number.

668015251684 is a deficient number, since it is larger than the sum of its proper divisors (633730371557).

668015251684 is an equidigital number, since it uses as much as digits as its factorization.

668015251684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 668015251684 in words is "six hundred sixty-eight billion, fifteen million, two hundred fifty-one thousand, six hundred eighty-four".