25142420556 has 72 divisors (see below), whose sum is σ = 69555403008. Its totient is φ = 7594380000.

The previous prime is 25142420549. The next prime is 25142420573. The reversal of 25142420556 is 65502424152.

25142420556 is a `hidden beast` number, since 25 + 1 + 42 + 42 + 0 + 556 = 666.

It is a super-2 number, since 2×25142420556² (a number of 22 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 25142420556.

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, 21081 + ... + 225231.

It is an arithmetic number, because the mean of its divisors is an integer number (966047264).

Almost surely, 2^25142420556 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 25142420556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34777701504).

25142420556 is an abundant number, since it is smaller than the sum of its proper divisors (44412982452).

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

25142420556 is a wasteful number, since it uses less digits than its factorization.

25142420556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204483 (or 204478 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 25142420556 in words is "twenty-five billion, one hundred forty-two million, four hundred twenty thousand, five hundred fifty-six".