78651693125 has 10 divisors (see below), whose sum is σ = 98283156510. Its totient is φ = 62921354000.

The previous prime is 78651693103. The next prime is 78651693151. The reversal of 78651693125 is 52139615687.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 57254439841 + 21397253284 = 239279^2 + 146278^2 .

It is not a de Polignac number, because 78651693125 - 2¹⁶ = 78651627589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62920730 + ... + 62921979.

It is an arithmetic number, because the mean of its divisors is an integer number (9828315651).

Almost surely, 2^78651693125 is an apocalyptic number.

It is an amenable number.

78651693125 is a deficient number, since it is larger than the sum of its proper divisors (19631463385).

78651693125 is an equidigital number, since it uses as much as digits as its factorization.

78651693125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125842729 (or 125842714 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 53.

The spelling of 78651693125 in words is "seventy-eight billion, six hundred fifty-one million, six hundred ninety-three thousand, one hundred twenty-five".