63866225 has 6 divisors (see below), whose sum is σ = 79194150. Its totient is φ = 51092960.

The previous prime is 63866221. The next prime is 63866227. The reversal of 63866225 is 52266836.

It can be written as a sum of positive squares in 3 ways, for example, as 58081 + 63808144 = 241^2 + 7988^2 .

It is not a de Polignac number, because 63866225 - 2² = 63866221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63866221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1277300 + ... + 1277349.

It is an arithmetic number, because the mean of its divisors is an integer number (13199025).

Almost surely, 2^63866225 is an apocalyptic number.

It is an amenable number.

63866225 is a deficient number, since it is larger than the sum of its proper divisors (15327925).

63866225 is a wasteful number, since it uses less digits than its factorization.

63866225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554659 (or 2554654 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The square root of 63866225 is about 7991.6346888481. The cubic root of 63866225 is about 399.7211076762.

The spelling of 63866225 in words is "sixty-three million, eight hundred sixty-six thousand, two hundred twenty-five".