178428398825 has 12 divisors (see below), whose sum is σ = 221257095708. Its totient is φ = 142738924800.

The previous prime is 178428398801. The next prime is 178428398843. The reversal of 178428398825 is 528893824871.

It can be written as a sum of positive squares in 6 ways, for example, as 85271592169 + 93156806656 = 292013^2 + 305216^2 .

It is not a de Polignac number, because 178428398825 - 2⁸ = 178428398569 is a prime.

It is a super-2 number, since 2×178428398825² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1224029 + ... + 1362021.

It is an arithmetic number, because the mean of its divisors is an integer number (18438091309).

Almost surely, 2^178428398825 is an apocalyptic number.

It is an amenable number.

178428398825 is a deficient number, since it is larger than the sum of its proper divisors (42828696883).

178428398825 is a wasteful number, since it uses less digits than its factorization.

178428398825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189724 (or 189719 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 65.

The spelling of 178428398825 in words is "one hundred seventy-eight billion, four hundred twenty-eight million, three hundred ninety-eight thousand, eight hundred twenty-five".