668063000221 has 4 divisors (see below), whose sum is σ = 668530505500. Its totient is φ = 667595494944.

The previous prime is 668063000179. The next prime is 668063000233. The reversal of 668063000221 is 122000360866.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 271559800996 + 396503199225 = 521114^2 + 629685^2 .

It is a cyclic number.

It is not a de Polignac number, because 668063000221 - 2⁷ = 668063000093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668063000261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233750496 + ... + 233753353.

It is an arithmetic number, because the mean of its divisors is an integer number (167132626375).

Almost surely, 2^668063000221 is an apocalyptic number.

It is an amenable number.

668063000221 is a deficient number, since it is larger than the sum of its proper divisors (467505279).

668063000221 is a wasteful number, since it uses less digits than its factorization.

668063000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467505278.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 668063000221 in words is "six hundred sixty-eight billion, sixty-three million, two hundred twenty-one", and thus it is an aban number.