78864967554025 has 9 divisors (see below), whose sum is σ = 97792614826711. Its totient is φ = 63091938520840.

The previous prime is 78864967554013. The next prime is 78864967554029. The reversal of 78864967554025 is 52045576946887.

It is a happy number.

The square root of 78864967554025 is 8880595.

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., 28391388319449 + 50473579234576 = 5328357^2 + 7104476^2 .

It is not a de Polignac number, because 78864967554025 - 2¹⁷ = 78864967422953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78864967554029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43514916 + ... + 45291034.

Almost surely, 2^{78864967554025} is an apocalyptic number.

78864967554025 is the 8880595-th square number.

78864967554025 is the 4440298-th centered octagonal number.

It is an amenable number.

78864967554025 is a deficient number, since it is larger than the sum of its proper divisors (18927647272686).

78864967554025 is an frugal number, since it uses more digits than its factorization.

78864967554025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552248 (or 1776124 counting only the distinct ones).

The product of its (nonzero) digits is 4064256000, while the sum is 76.

The spelling of 78864967554025 in words is "seventy-eight trillion, eight hundred sixty-four billion, nine hundred sixty-seven million, five hundred fifty-four thousand, twenty-five".