668051256829 has 4 divisors (see below), whose sum is σ = 728783189280. Its totient is φ = 607319324380.

The previous prime is 668051256811. The next prime is 668051256853. The reversal of 668051256829 is 928652150866.

It is a happy number.

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 668051256829 - 2⁹ = 668051256317 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 (668051250829) 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, 30365966209 + ... + 30365966230.

It is an arithmetic number, because the mean of its divisors is an integer number (182195797320).

Almost surely, 2^668051256829 is an apocalyptic number.

It is an amenable number.

668051256829 is a deficient number, since it is larger than the sum of its proper divisors (60731932451).

668051256829 is a wasteful number, since it uses less digits than its factorization.

668051256829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60731932450.

The product of its (nonzero) digits is 12441600, while the sum is 58.

The spelling of 668051256829 in words is "six hundred sixty-eight billion, fifty-one million, two hundred fifty-six thousand, eight hundred twenty-nine".