425640431934 has 128 divisors (see below), whose sum is σ = 995115663360. Its totient is φ = 134693733600.

The previous prime is 425640431921. The next prime is 425640431969. The reversal of 425640431934 is 439134046524.

425640431934 is a `hidden beast` number, since 4 + 2 + 56 + 404 + 3 + 193 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 425640431934.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18437619 + ... + 18460689.

It is an arithmetic number, because the mean of its divisors is an integer number (7774341120).

Almost surely, 2^425640431934 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 425640431934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497557831680).

425640431934 is an abundant number, since it is smaller than the sum of its proper divisors (569475231426).

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

425640431934 is a wasteful number, since it uses less digits than its factorization.

425640431934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23323 (or 23317 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 425640431934 in words is "four hundred twenty-five billion, six hundred forty million, four hundred thirty-one thousand, nine hundred thirty-four".