78564025489 has 2 divisors, whose sum is σ = 78564025490. Its totient is φ = 78564025488.

The previous prime is 78564025457. The next prime is 78564025499. The reversal of 78564025489 is 98452046587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73531541889 + 5032483600 = 271167^2 + 70940^2 .

It is a cyclic number.

It is not a de Polignac number, because 78564025489 - 2⁵ = 78564025457 is a prime.

It is a super-2 number, since 2×78564025489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78564025499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39282012744 + 39282012745.

It is an arithmetic number, because the mean of its divisors is an integer number (39282012745).

Almost surely, 2^78564025489 is an apocalyptic number.

It is an amenable number.

78564025489 is a deficient number, since it is larger than the sum of its proper divisors (1).

78564025489 is an equidigital number, since it uses as much as digits as its factorization.

78564025489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19353600, while the sum is 58.

The spelling of 78564025489 in words is "seventy-eight billion, five hundred sixty-four million, twenty-five thousand, four hundred eighty-nine".