78510475297 has 2 divisors, whose sum is σ = 78510475298. Its totient is φ = 78510475296.

The previous prime is 78510475261. The next prime is 78510475391. The reversal of 78510475297 is 79257401587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70885867536 + 7624607761 = 266244^2 + 87319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78510475297 is a prime.

It is not a weakly prime, because it can be changed into another prime (78510475237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39255237648 + 39255237649.

It is an arithmetic number, because the mean of its divisors is an integer number (39255237649).

Almost surely, 2^78510475297 is an apocalyptic number.

It is an amenable number.

78510475297 is a deficient number, since it is larger than the sum of its proper divisors (1).

78510475297 is an equidigital number, since it uses as much as digits as its factorization.

78510475297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4939200, while the sum is 55.

The spelling of 78510475297 in words is "seventy-eight billion, five hundred ten million, four hundred seventy-five thousand, two hundred ninety-seven".