864779104225 has 9 divisors (see below), whose sum is σ = 1072331854867. Its totient is φ = 691819563640.

The previous prime is 864779104213. The next prime is 864779104271. The reversal of 864779104225 is 522401977468.

The square root of 864779104225 is 929935.

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., 311320477521 + 553458626704 = 557961^2 + 743948^2 .

It is not a de Polignac number, because 864779104225 - 2⁷ = 864779104097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4556682 + ... + 4742668.

Almost surely, 2^864779104225 is an apocalyptic number.

864779104225 is the 929935-th square number.

864779104225 is the 464968-th centered octagonal number.

It is an amenable number.

864779104225 is a deficient number, since it is larger than the sum of its proper divisors (207552750642).

864779104225 is an frugal number, since it uses more digits than its factorization.

864779104225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371984 (or 185992 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 864779104225 in words is "eight hundred sixty-four billion, seven hundred seventy-nine million, one hundred four thousand, two hundred twenty-five".