76864558649 has 2 divisors, whose sum is σ = 76864558650. Its totient is φ = 76864558648.

The previous prime is 76864558637. The next prime is 76864558651. The reversal of 76864558649 is 94685546867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64335786025 + 12528772624 = 253645^2 + 111932^2 .

It is a cyclic number.

It is not a de Polignac number, because 76864558649 - 2¹⁶ = 76864493113 is a prime.

Together with 76864558651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76864588649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38432279324 + 38432279325.

It is an arithmetic number, because the mean of its divisors is an integer number (38432279325).

Almost surely, 2^76864558649 is an apocalyptic number.

It is an amenable number.

76864558649 is a deficient number, since it is larger than the sum of its proper divisors (1).

76864558649 is an equidigital number, since it uses as much as digits as its factorization.

76864558649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 348364800, while the sum is 68.

The spelling of 76864558649 in words is "seventy-six billion, eight hundred sixty-four million, five hundred fifty-eight thousand, six hundred forty-nine".