25567215492 has 144 divisors (see below), whose sum is σ = 75007199232. Its totient is φ = 6718440960.

The previous prime is 25567215491. The next prime is 25567215493. The reversal of 25567215492 is 29451276552.

It is an interprime number because it is at equal distance from previous prime (25567215491) and next prime (25567215493).

It is not an unprimeable number, because it can be changed into a prime (25567215491) 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, 2142013 + ... + 2153915.

It is an arithmetic number, because the mean of its divisors is an integer number (520883328).

Almost surely, 2^25567215492 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 25567215492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37503599616).

25567215492 is an abundant number, since it is smaller than the sum of its proper divisors (49439983740).

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

25567215492 is a wasteful number, since it uses less digits than its factorization.

25567215492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12218 (or 12209 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 48.

The spelling of 25567215492 in words is "twenty-five billion, five hundred sixty-seven million, two hundred fifteen thousand, four hundred ninety-two".