668471412281 has 4 divisors (see below), whose sum is σ = 697535386752. Its totient is φ = 639407437812.

The previous prime is 668471412253. The next prime is 668471412331. The reversal of 668471412281 is 182214174866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668471412281 - 2³⁸ = 393593505337 is a prime.

It is a super-2 number, since 2×668471412281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668471412211) 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, 14531987201 + ... + 14531987246.

It is an arithmetic number, because the mean of its divisors is an integer number (174383846688).

Almost surely, 2^668471412281 is an apocalyptic number.

It is an amenable number.

668471412281 is a deficient number, since it is larger than the sum of its proper divisors (29063974471).

668471412281 is a wasteful number, since it uses less digits than its factorization.

668471412281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29063974470.

The product of its digits is 1032192, while the sum is 50.

The spelling of 668471412281 in words is "six hundred sixty-eight billion, four hundred seventy-one million, four hundred twelve thousand, two hundred eighty-one".