866115225 has 18 divisors (see below), whose sum is σ = 1551309006. Its totient is φ = 461928000.

The previous prime is 866115193. The next prime is 866115253. The reversal of 866115225 is 522511668.

It can be written as a sum of positive squares in 3 ways, for example, as 4575321 + 861539904 = 2139^2 + 29352^2 .

It is not a de Polignac number, because 866115225 - 2⁵ = 866115193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866115225.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1924476 + ... + 1924925.

Almost surely, 2^866115225 is an apocalyptic number.

It is an amenable number.

866115225 is a deficient number, since it is larger than the sum of its proper divisors (685193781).

866115225 is a wasteful number, since it uses less digits than its factorization.

866115225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849417 (or 3849409 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 866115225 is about 29429.8356264523. The cubic root of 866115225 is about 953.2172455376.

The spelling of 866115225 in words is "eight hundred sixty-six million, one hundred fifteen thousand, two hundred twenty-five".