668020411826 has 4 divisors (see below), whose sum is σ = 1002030617742. Its totient is φ = 334010205912.

The previous prime is 668020411811. The next prime is 668020411841. The reversal of 668020411826 is 628114020866.

It is a happy number.

668020411826 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (668020411811) and next prime (668020411841).

It can be written as a sum of positive squares in only one way, i.e., 624360727225 + 43659684601 = 790165^2 + 208949^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167005102955 + ... + 167005102958.

Almost surely, 2^668020411826 is an apocalyptic number.

668020411826 is a deficient number, since it is larger than the sum of its proper divisors (334010205916).

668020411826 is a wasteful number, since it uses less digits than its factorization.

668020411826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334010205915.

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 668020411826 in words is "six hundred sixty-eight billion, twenty million, four hundred eleven thousand, eight hundred twenty-six".