776751382225 has 135 divisors (see below), whose sum is σ = 1221990568197. Its totient is φ = 488358299520.

The previous prime is 776751382201. The next prime is 776751382247. The reversal of 776751382225 is 522283157677.

It is a happy number.

The square root of 776751382225 is 881335.

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

It can be written as a sum of positive squares in 22 ways, for example, as 34272746641 + 742478635584 = 185129^2 + 861672^2 .

It is not a de Polignac number, because 776751382225 - 2⁹ = 776751381713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 5213096451 + ... + 5213096599.

Almost surely, 2^776751382225 is an apocalyptic number.

776751382225 is the 881335-th square number.

776751382225 is the 440668-th centered octagonal number.

It is an amenable number.

776751382225 is a deficient number, since it is larger than the sum of its proper divisors (445239185972).

776751382225 is an frugal number, since it uses more digits than its factorization.

776751382225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 174 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 55.

The spelling of 776751382225 in words is "seven hundred seventy-six billion, seven hundred fifty-one million, three hundred eighty-two thousand, two hundred twenty-five".