78776650957 has 2 divisors, whose sum is σ = 78776650958. Its totient is φ = 78776650956.

The previous prime is 78776650913. The next prime is 78776650961. The reversal of 78776650957 is 75905667787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62075224201 + 16701426756 = 249149^2 + 129234^2 .

It is a cyclic number.

It is not a de Polignac number, because 78776650957 - 2²⁷ = 78642433229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78776650892 and 78776650901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78776659957) 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, 39388325478 + 39388325479.

It is an arithmetic number, because the mean of its divisors is an integer number (39388325479).

Almost surely, 2^78776650957 is an apocalyptic number.

It is an amenable number.

78776650957 is a deficient number, since it is larger than the sum of its proper divisors (1).

78776650957 is an equidigital number, since it uses as much as digits as its factorization.

78776650957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155584800, while the sum is 67.

The spelling of 78776650957 in words is "seventy-eight billion, seven hundred seventy-six million, six hundred fifty thousand, nine hundred fifty-seven".