78423865725 has 24 divisors (see below), whose sum is σ = 129669772032. Its totient is φ = 41823164800.

The previous prime is 78423865721. The next prime is 78423865787. The reversal of 78423865725 is 52756832487.

It is not a de Polignac number, because 78423865725 - 2² = 78423865721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78423865721) 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 in 23 ways as a sum of consecutive naturals, for example, 1467220 + ... + 1519730.

It is an arithmetic number, because the mean of its divisors is an integer number (5402907168).

Almost surely, 2^78423865725 is an apocalyptic number.

78423865725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78423865725 is a deficient number, since it is larger than the sum of its proper divisors (51245906307).

78423865725 is a wasteful number, since it uses less digits than its factorization.

78423865725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72437 (or 72432 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 57.

The spelling of 78423865725 in words is "seventy-eight billion, four hundred twenty-three million, eight hundred sixty-five thousand, seven hundred twenty-five".