667976197631 has 2 divisors, whose sum is σ = 667976197632. Its totient is φ = 667976197630.

The previous prime is 667976197591. The next prime is 667976197633. The reversal of 667976197631 is 136791679766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667976197631 - 2¹⁰ = 667976196607 is a prime.

It is a super-2 number, since 2×667976197631² (a number of 24 digits) contains 22 as substring.

Together with 667976197633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667976197633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333988098815 + 333988098816.

It is an arithmetic number, because the mean of its divisors is an integer number (333988098816).

Almost surely, 2^667976197631 is an apocalyptic number.

667976197631 is a deficient number, since it is larger than the sum of its proper divisors (1).

667976197631 is an equidigital number, since it uses as much as digits as its factorization.

667976197631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108020304, while the sum is 68.

The spelling of 667976197631 in words is "six hundred sixty-seven billion, nine hundred seventy-six million, one hundred ninety-seven thousand, six hundred thirty-one".