78265816425 has 36 divisors (see below), whose sum is σ = 140764542204. Its totient is φ = 41568537600.

The previous prime is 78265816393. The next prime is 78265816549. The reversal of 78265816425 is 52461856287.

78265816425 is a `hidden beast` number, since 7 + 82 + 65 + 81 + 6 + 425 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 7068101184 + 71197715241 = 84072^2 + 266829^2 .

It is not a de Polignac number, because 78265816425 - 2⁵ = 78265816393 is a prime.

It is a super-2 number, since 2×78265816425² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 667452 + ... + 775901.

Almost surely, 2^78265816425 is an apocalyptic number.

78265816425 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78265816425 is a deficient number, since it is larger than the sum of its proper divisors (62498725779).

78265816425 is a wasteful number, since it uses less digits than its factorization.

78265816425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443610 (or 1443602 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 54.

The spelling of 78265816425 in words is "seventy-eight billion, two hundred sixty-five million, eight hundred sixteen thousand, four hundred twenty-five".