668053267631 has 4 divisors (see below), whose sum is σ = 678024211992. Its totient is φ = 658082323272.

The previous prime is 668053267621. The next prime is 668053267703. The reversal of 668053267631 is 136762350866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136762350866 = 2 ⋅68381175433.

It is a cyclic number.

It is not a de Polignac number, because 668053267631 - 2²⁶ = 667986158767 is a prime.

It is a super-2 number, since 2×668053267631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668053267621) 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, 4985472080 + ... + 4985472213.

It is an arithmetic number, because the mean of its divisors is an integer number (169506052998).

Almost surely, 2^668053267631 is an apocalyptic number.

668053267631 is a deficient number, since it is larger than the sum of its proper divisors (9970944361).

668053267631 is an equidigital number, since it uses as much as digits as its factorization.

668053267631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9970944360.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 668053267631 in words is "six hundred sixty-eight billion, fifty-three million, two hundred sixty-seven thousand, six hundred thirty-one".