76549431649 has 2 divisors, whose sum is σ = 76549431650. Its totient is φ = 76549431648.

The previous prime is 76549431599. The next prime is 76549431659. The reversal of 76549431649 is 94613494567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56945231424 + 19604200225 = 238632^2 + 140015^2 .

It is an emirp because it is prime and its reverse (94613494567) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76549431649 - 2⁷ = 76549431521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 76549431593 and 76549431602.

It is not a weakly prime, because it can be changed into another prime (76549431659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38274715824 + 38274715825.

It is an arithmetic number, because the mean of its divisors is an integer number (38274715825).

Almost surely, 2^76549431649 is an apocalyptic number.

It is an amenable number.

76549431649 is a deficient number, since it is larger than the sum of its proper divisors (1).

76549431649 is an equidigital number, since it uses as much as digits as its factorization.

76549431649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 58.

The spelling of 76549431649 in words is "seventy-six billion, five hundred forty-nine million, four hundred thirty-one thousand, six hundred forty-nine".