668051256831 has 24 divisors (see below), whose sum is σ = 1036233036720.
Its totient is φ = 381717084672.
The previous prime is 668051256811. The next prime is 668051256853. The reversal of 668051256831 is 138652150866.
It is a happy number.
It is not a de Polignac number, because 668051256831 - 25 = 668051256799 is a prime.
It is a super-2 number, since 2×6680512568312 (a number of 24 digits) contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (668051256811) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2075025 + ... + 2375253.
It is an arithmetic number, because the mean of its divisors is an integer number (43176376530).
Almost surely, 2668051256831 is an apocalyptic number.
668051256831 is a deficient number, since it is larger than the sum of its proper divisors (368181779889).
668051256831 is a wasteful number, since it uses less digits than its factorization.
668051256831 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 315383 (or 315376 counting only the distinct ones).
The product of its (nonzero) digits is 2073600, while the sum is 51.
The spelling of 668051256831 in words is "six hundred sixty-eight billion, fifty-one million, two hundred fifty-six thousand, eight hundred thirty-one".