425581665 has 32 divisors (see below), whose sum is σ = 722304000. Its totient is φ = 213370560.

The previous prime is 425581657. The next prime is 425581669. The reversal of 425581665 is 566185524.

It is not a de Polignac number, because 425581665 - 2³ = 425581657 is a prime.

It is a super-2 number, since 2×425581665² = 362239507168344450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (425581669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31636 + ... + 43034.

It is an arithmetic number, because the mean of its divisors is an integer number (22572000).

Almost surely, 2^425581665 is an apocalyptic number.

It is an amenable number.

425581665 is a deficient number, since it is larger than the sum of its proper divisors (296722335).

425581665 is a wasteful number, since it uses less digits than its factorization.

425581665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11557.

The product of its digits is 288000, while the sum is 42.

The square root of 425581665 is about 20629.6307528758. The cubic root of 425581665 is about 752.1901403769.

The spelling of 425581665 in words is "four hundred twenty-five million, five hundred eighty-one thousand, six hundred sixty-five".