76866753581 has 2 divisors, whose sum is σ = 76866753582. Its totient is φ = 76866753580.

The previous prime is 76866753539. The next prime is 76866753611. The reversal of 76866753581 is 18535766867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43111877956 + 33754875625 = 207634^2 + 183725^2 .

It is a cyclic number.

It is not a de Polignac number, because 76866753581 - 2²⁶ = 76799644717 is a prime.

It is a super-2 number, since 2×76866753581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76866753511) 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, 38433376790 + 38433376791.

It is an arithmetic number, because the mean of its divisors is an integer number (38433376791).

Almost surely, 2^76866753581 is an apocalyptic number.

It is an amenable number.

76866753581 is a deficient number, since it is larger than the sum of its proper divisors (1).

76866753581 is an equidigital number, since it uses as much as digits as its factorization.

76866753581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50803200, while the sum is 62.

The spelling of 76866753581 in words is "seventy-six billion, eight hundred sixty-six million, seven hundred fifty-three thousand, five hundred eighty-one".