78257850725 has 12 divisors (see below), whose sum is σ = 97047275556. Its totient is φ = 62601415680.

The previous prime is 78257850683. The next prime is 78257850743. The reversal of 78257850725 is 52705875287.

It can be written as a sum of positive squares in 6 ways, for example, as 1450162561 + 76807688164 = 38081^2 + 277142^2 .

It is not a de Polignac number, because 78257850725 - 2⁶ = 78257850661 is a prime.

It is a super-2 number, since 2×78257850725² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226019 + ... + 455631.

It is an arithmetic number, because the mean of its divisors is an integer number (8087272963).

Almost surely, 2^78257850725 is an apocalyptic number.

It is an amenable number.

78257850725 is a deficient number, since it is larger than the sum of its proper divisors (18789424831).

78257850725 is a wasteful number, since it uses less digits than its factorization.

78257850725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243256 (or 243251 counting only the distinct ones).

The product of its (nonzero) digits is 10976000, while the sum is 56.

The spelling of 78257850725 in words is "seventy-eight billion, two hundred fifty-seven million, eight hundred fifty thousand, seven hundred twenty-five".