668279428353 has 40 divisors (see below), whose sum is σ = 1057125274920. Its totient is φ = 419269685760.

The previous prime is 668279428343. The next prime is 668279428417. The reversal of 668279428353 is 353824972866.

It is a happy number.

668279428353 is a `hidden beast` number, since 6 + 6 + 8 + 279 + 4 + 2 + 8 + 353 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 244962633969 + 423316794384 = 494937^2 + 650628^2 .

It is not a de Polignac number, because 668279428353 - 2⁸ = 668279428097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668279428343) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18407503 + ... + 18443771.

It is an arithmetic number, because the mean of its divisors is an integer number (26428131873).

Almost surely, 2^668279428353 is an apocalyptic number.

It is an amenable number.

668279428353 is a deficient number, since it is larger than the sum of its proper divisors (388845846567).

668279428353 is a wasteful number, since it uses less digits than its factorization.

668279428353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49679 (or 49670 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 63.

The spelling of 668279428353 in words is "six hundred sixty-eight billion, two hundred seventy-nine million, four hundred twenty-eight thousand, three hundred fifty-three".