78402534825 has 12 divisors (see below), whose sum is σ = 129625524368. Its totient is φ = 41814685200.

The previous prime is 78402534823. The next prime is 78402534851. The reversal of 78402534825 is 52843520487.

It is not a de Polignac number, because 78402534825 - 2¹ = 78402534823 is a prime.

It is a super-2 number, since 2×78402534825² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78402534823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522683491 + ... + 522683640.

Almost surely, 2^78402534825 is an apocalyptic number.

78402534825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78402534825 is a deficient number, since it is larger than the sum of its proper divisors (51222989543).

78402534825 is a wasteful number, since it uses less digits than its factorization.

78402534825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045367144 (or 1045367139 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 48.

The spelling of 78402534825 in words is "seventy-eight billion, four hundred two million, five hundred thirty-four thousand, eight hundred twenty-five".