866419225 has 45 divisors (see below), whose sum is σ = 1294399947. Its totient is φ = 573629280.

The previous prime is 866419201. The next prime is 866419231. The reversal of 866419225 is 522914668.

The square root of 866419225 is 29435.

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

It can be written as a sum of positive squares in 7 ways, for example, as 513430281 + 352988944 = 22659^2 + 18788^2 .

It is not a de Polignac number, because 866419225 - 2⁵ = 866419193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 29876511 + ... + 29876539.

Almost surely, 2^866419225 is an apocalyptic number.

866419225 is the 29435-th square number.

866419225 is the 14718-th centered octagonal number.

It is an amenable number.

866419225 is a deficient number, since it is larger than the sum of its proper divisors (427980722).

866419225 is an frugal number, since it uses more digits than its factorization.

866419225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 41 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The cubic root of 866419225 is about 953.3287565459.

It can be divided in two parts, 8664 and 19225, that added together give a square (27889 = 167²).

The spelling of 866419225 in words is "eight hundred sixty-six million, four hundred nineteen thousand, two hundred twenty-five".