866447425 has 6 divisors (see below), whose sum is σ = 1074394838. Its totient is φ = 693157920.

The previous prime is 866447419. The next prime is 866447437. The reversal of 866447425 is 524744668.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 102090816 + 764356609 = 10104^2 + 27647^2 .

It is not a de Polignac number, because 866447425 - 2¹⁵ = 866414657 is a prime.

It is a super-2 number, since 2×866447425² = 1501462280578261250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17328924 + ... + 17328973.

Almost surely, 2^866447425 is an apocalyptic number.

It is an amenable number.

866447425 is a deficient number, since it is larger than the sum of its proper divisors (207947413).

866447425 is a wasteful number, since it uses less digits than its factorization.

866447425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34657907 (or 34657902 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 46.

The square root of 866447425 is about 29435.4790176753. The cubic root of 866447425 is about 953.3390993370.

The spelling of 866447425 in words is "eight hundred sixty-six million, four hundred forty-seven thousand, four hundred twenty-five".