78776476013 has 2 divisors, whose sum is σ = 78776476014. Its totient is φ = 78776476012.

The previous prime is 78776475977. The next prime is 78776476063. The reversal of 78776476013 is 31067467787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52570694089 + 26205781924 = 229283^2 + 161882^2 .

It is a cyclic number.

It is not a de Polignac number, because 78776476013 - 2⁶ = 78776475949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78776476013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78776476063) 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, 39388238006 + 39388238007.

It is an arithmetic number, because the mean of its divisors is an integer number (39388238007).

Almost surely, 2^78776476013 is an apocalyptic number.

It is an amenable number.

78776476013 is a deficient number, since it is larger than the sum of its proper divisors (1).

78776476013 is an equidigital number, since it uses as much as digits as its factorization.

78776476013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8297856, while the sum is 56.

The spelling of 78776476013 in words is "seventy-eight billion, seven hundred seventy-six million, four hundred seventy-six thousand, thirteen".