879338661786025 has 27 divisors (see below), whose sum is σ = 1268402652496119. Its totient is φ = 602974370680080.

The previous prime is 879338661785981. The next prime is 879338661786047. The reversal of 879338661786025 is 520687166833978.

The square root of 879338661786025 is 29653645.

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

It can be written as a sum of positive squares in only one way, i.e., 316561918242969 + 562776743543056 = 17792187^2 + 23722916^2 .

It is not a de Polignac number, because 879338661786025 - 2²³ = 879338653397417 is a prime.

It is a super-2 number, since 2×879338661786025² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1037453952 + ... + 1038301198.

Almost surely, 2^{879338661786025} is an apocalyptic number.

879338661786025 is the 29653645-th square number.

879338661786025 is the 14826823-rd centered octagonal number.

It is an amenable number.

879338661786025 is a deficient number, since it is larger than the sum of its proper divisors (389063990710094).

879338661786025 is an frugal number, since it uses more digits than its factorization.

879338661786025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694518 (or 847259 counting only the distinct ones).

The product of its (nonzero) digits is 4389396480, while the sum is 79.

The spelling of 879338661786025 in words is "eight hundred seventy-nine trillion, three hundred thirty-eight billion, six hundred sixty-one million, seven hundred eighty-six thousand, twenty-five".