425661660 has 72 divisors (see below), whose sum is σ = 1312374336. Its totient is φ = 111646080.

The previous prime is 425661659. The next prime is 425661679. The reversal of 425661660 is 66166524.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8404 + ... + 30363.

Almost surely, 2^425661660 is an apocalyptic number.

It is an amenable number.

425661660 is an abundant number, since it is smaller than the sum of its proper divisors (886712676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

425661660 is a wasteful number, since it uses less digits than its factorization.

425661660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38843 (or 38838 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 425661660 is about 20631.5694991923. The cubic root of 425661660 is about 752.2372662171.

The spelling of 425661660 in words is "four hundred twenty-five million, six hundred sixty-one thousand, six hundred sixty".