78564025457 has 2 divisors, whose sum is σ = 78564025458. Its totient is φ = 78564025456.

The previous prime is 78564025453. The next prime is 78564025489. The reversal of 78564025457 is 75452046587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63687588496 + 14876436961 = 252364^2 + 121969^2 .

It is a cyclic number.

It is not a de Polignac number, because 78564025457 - 2² = 78564025453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78564025399 and 78564025408.

It is not a weakly prime, because it can be changed into another prime (78564025453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39282012728 + 39282012729.

It is an arithmetic number, because the mean of its divisors is an integer number (39282012729).

Almost surely, 2^78564025457 is an apocalyptic number.

It is an amenable number.

78564025457 is a deficient number, since it is larger than the sum of its proper divisors (1).

78564025457 is an equidigital number, since it uses as much as digits as its factorization.

78564025457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408000, while the sum is 53.

The spelling of 78564025457 in words is "seventy-eight billion, five hundred sixty-four million, twenty-five thousand, four hundred fifty-seven".