25620221396 has 48 divisors (see below), whose sum is σ = 56002353792. Its totient is φ = 9963388800.

The previous prime is 25620221383. The next prime is 25620221411. The reversal of 25620221396 is 69312202652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89750 + ... + 243506.

It is an arithmetic number, because the mean of its divisors is an integer number (1166715704).

Almost surely, 2^25620221396 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 25620221396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28001176896).

25620221396 is an abundant number, since it is smaller than the sum of its proper divisors (30382132396).

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

25620221396 is a wasteful number, since it uses less digits than its factorization.

25620221396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154320 (or 154318 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 25620221396 in words is "twenty-five billion, six hundred twenty million, two hundred twenty-one thousand, three hundred ninety-six".