425661 has 16 divisors (see below), whose sum is σ = 614400. Its totient is φ = 261360.

The previous prime is 425653. The next prime is 425681. The reversal of 425661 is 166524.

It is not a de Polignac number, because 425661 - 2³ = 425653 is a prime.

It is an Ulam number.

425661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2040 + ... + 2238.

It is an arithmetic number, because the mean of its divisors is an integer number (38400).

2⁴²⁵⁶⁶¹ is an apocalyptic number.

It is an amenable number.

425661 is a deficient number, since it is larger than the sum of its proper divisors (188739).

425661 is a wasteful number, since it uses less digits than its factorization.

425661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256.

The product of its digits is 1440, while the sum is 24.

The square root of 425661 is about 652.4270074116. The cubic root of 425661 is about 75.2236877429.

The spelling of 425661 in words is "four hundred twenty-five thousand, six hundred sixty-one".