77902395449 has 2 divisors, whose sum is σ = 77902395450. Its totient is φ = 77902395448.

The previous prime is 77902395443. The next prime is 77902395451. The reversal of 77902395449 is 94459320977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77108959225 + 793436224 = 277685^2 + 28168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77902395449 is a prime.

It is a Sophie Germain prime.

Together with 77902395451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77902395443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38951197724 + 38951197725.

It is an arithmetic number, because the mean of its divisors is an integer number (38951197725).

Almost surely, 2^77902395449 is an apocalyptic number.

It is an amenable number.

77902395449 is a deficient number, since it is larger than the sum of its proper divisors (1).

77902395449 is an equidigital number, since it uses as much as digits as its factorization.

77902395449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 59.

The spelling of 77902395449 in words is "seventy-seven billion, nine hundred two million, three hundred ninety-five thousand, four hundred forty-nine".