25718221932 has 108 divisors (see below), whose sum is σ = 68582331720. Its totient is φ = 7496596224.

The previous prime is 25718221901. The next prime is 25718221957. The reversal of 25718221932 is 23912281752.

It is a super-2 number, since 2×25718221932² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 714544 + ... + 749672.

It is an arithmetic number, because the mean of its divisors is an integer number (635021590).

Almost surely, 2^25718221932 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 25718221932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34291165860).

25718221932 is an abundant number, since it is smaller than the sum of its proper divisors (42864109788).

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

25718221932 is a wasteful number, since it uses less digits than its factorization.

25718221932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35200 (or 35166 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The spelling of 25718221932 in words is "twenty-five billion, seven hundred eighteen million, two hundred twenty-one thousand, nine hundred thirty-two".