19425943656 has 192 divisors, whose sum is σ = 63836398080. Its totient is φ = 5209712640.

The previous prime is 19425943651. The next prime is 19425943709. The reversal of 19425943656 is 65634952491.

19425943656 is a `hidden beast` number, since 1 + 9 + 42 + 594 + 3 + 6 + 5 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (19425943651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3398641 + ... + 3404351.

It is an arithmetic number, because the mean of its divisors is an integer number (332481240).

Almost surely, 2^19425943656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19425943656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31918199040).

19425943656 is an abundant number, since it is smaller than the sum of its proper divisors (44410454424).

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

19425943656 is a wasteful number, since it uses less digits than its factorization.

19425943656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6144 (or 6137 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The spelling of 19425943656 in words is "nineteen billion, four hundred twenty-five million, nine hundred forty-three thousand, six hundred fifty-six".