9931977667 has 2 divisors, whose sum is σ = 9931977668. Its totient is φ = 9931977666.

The previous prime is 9931977661. The next prime is 9931977689. The reversal of 9931977667 is 7667791399.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9931977667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9931977599 and 9931977608.

It is not a weakly prime, because it can be changed into another prime (9931977661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4965988833 + 4965988834.

It is an arithmetic number, because the mean of its divisors is an integer number (4965988834).

Almost surely, 2^9931977667 is an apocalyptic number.

9931977667 is a deficient number, since it is larger than the sum of its proper divisors (1).

9931977667 is an equidigital number, since it uses as much as digits as its factorization.

9931977667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27005076, while the sum is 64.

The square root of 9931977667 is about 99659.3079797366. The cubic root of 9931977667 is about 2149.5385825747.

The spelling of 9931977667 in words is "nine billion, nine hundred thirty-one million, nine hundred seventy-seven thousand, six hundred sixty-seven".