76775737561 has 2 divisors, whose sum is σ = 76775737562. Its totient is φ = 76775737560.

The previous prime is 76775737559. The next prime is 76775737573. The reversal of 76775737561 is 16573757767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61494080400 + 15281657161 = 247980^2 + 123619^2 .

It is a cyclic number.

It is not a de Polignac number, because 76775737561 - 2¹ = 76775737559 is a prime.

Together with 76775737559, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 76775737561.

It is not a weakly prime, because it can be changed into another prime (76775737261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38387868780 + 38387868781.

It is an arithmetic number, because the mean of its divisors is an integer number (38387868781).

Almost surely, 2^76775737561 is an apocalyptic number.

It is an amenable number.

76775737561 is a deficient number, since it is larger than the sum of its proper divisors (1).

76775737561 is an equidigital number, since it uses as much as digits as its factorization.

76775737561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45378900, while the sum is 61.

The spelling of 76775737561 in words is "seventy-six billion, seven hundred seventy-five million, seven hundred thirty-seven thousand, five hundred sixty-one".