817227556025 has 12 divisors (see below), whose sum is σ = 1013374935612. Its totient is φ = 653773808640.

The previous prime is 817227556021. The next prime is 817227556049. The reversal of 817227556025 is 520655722718.

It can be written as a sum of positive squares in 6 ways, for example, as 44044997161 + 773182558864 = 209869^2 + 879308^2 .

It is not a de Polignac number, because 817227556025 - 2² = 817227556021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (817227556021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2532209 + ... + 2836641.

It is an arithmetic number, because the mean of its divisors is an integer number (84447911301).

Almost surely, 2^817227556025 is an apocalyptic number.

It is an amenable number.

817227556025 is a deficient number, since it is larger than the sum of its proper divisors (196147379587).

817227556025 is a wasteful number, since it uses less digits than its factorization.

817227556025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411820 (or 411815 counting only the distinct ones).

The product of its (nonzero) digits is 2352000, while the sum is 50.

The spelling of 817227556025 in words is "eight hundred seventeen billion, two hundred twenty-seven million, five hundred fifty-six thousand, twenty-five".