25434626021256 has 128 divisors (see below), whose sum is σ = 66545449286400. Its totient is φ = 8085875466240.

The previous prime is 25434626021251. The next prime is 25434626021269. The reversal of 25434626021256 is 65212062643452.

It is not an unprimeable number, because it can be changed into a prime (25434626021251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 348340080 + ... + 348413088.

It is an arithmetic number, because the mean of its divisors is an integer number (519886322550).

Almost surely, 2^{25434626021256} 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 25434626021256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33272724643200).

25434626021256 is an abundant number, since it is smaller than the sum of its proper divisors (41110823265144).

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

25434626021256 is a wasteful number, since it uses less digits than its factorization.

25434626021256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74879 (or 74875 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 25434626021256 in words is "twenty-five trillion, four hundred thirty-four billion, six hundred twenty-six million, twenty-one thousand, two hundred fifty-six".