68167636991 has 2 divisors, whose sum is σ = 68167636992. Its totient is φ = 68167636990.

The previous prime is 68167636967. The next prime is 68167636997. The reversal of 68167636991 is 19963676186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68167636991 - 2²² = 68163442687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68167636997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34083818495 + 34083818496.

It is an arithmetic number, because the mean of its divisors is an integer number (34083818496).

Almost surely, 2^68167636991 is an apocalyptic number.

68167636991 is a deficient number, since it is larger than the sum of its proper divisors (1).

68167636991 is an equidigital number, since it uses as much as digits as its factorization.

68167636991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 62.

The spelling of 68167636991 in words is "sixty-eight billion, one hundred sixty-seven million, six hundred thirty-six thousand, nine hundred ninety-one".