65164438991 has 2 divisors, whose sum is σ = 65164438992. Its totient is φ = 65164438990.

The previous prime is 65164438957. The next prime is 65164439089. The reversal of 65164438991 is 19983446156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65164438991 - 2²⁶ = 65097330127 is a prime.

It is a super-2 number, since 2×65164438991² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65164438091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32582219495 + 32582219496.

It is an arithmetic number, because the mean of its divisors is an integer number (32582219496).

Almost surely, 2^65164438991 is an apocalyptic number.

65164438991 is a deficient number, since it is larger than the sum of its proper divisors (1).

65164438991 is an equidigital number, since it uses as much as digits as its factorization.

65164438991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 56.

The spelling of 65164438991 in words is "sixty-five billion, one hundred sixty-four million, four hundred thirty-eight thousand, nine hundred ninety-one".