878109555625 has 15 divisors (see below), whose sum is σ = 1097314975713. Its totient is φ = 702468903000.

The previous prime is 878109555593. The next prime is 878109555647. The reversal of 878109555625 is 526555901878.

The square root of 878109555625 is 937075.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 68843789161 + 809265766464 = 262381^2 + 899592^2 .

It is not a de Polignac number, because 878109555625 - 2⁵ = 878109555593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 23408134 + ... + 23445616.

Almost surely, 2^878109555625 is an apocalyptic number.

878109555625 is the 937075-th square number.

878109555625 is the 468538-th centered octagonal number.

It is an amenable number.

878109555625 is a deficient number, since it is larger than the sum of its proper divisors (219205420088).

878109555625 is an frugal number, since it uses more digits than its factorization.

878109555625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74986 (or 37488 counting only the distinct ones).

The product of its (nonzero) digits is 30240000, while the sum is 61.

The spelling of 878109555625 in words is "eight hundred seventy-eight billion, one hundred nine million, five hundred fifty-five thousand, six hundred twenty-five".