25111412500 has 72 divisors (see below), whose sum is σ = 55829848536. Its totient is φ = 9879600000.

The previous prime is 25111412483. The next prime is 25111412509. The reversal of 25111412500 is 521411152.

It can be written as a sum of positive squares in 12 ways, for example, as 18394954384 + 6716458116 = 135628^2 + 81954^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25111412509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 746034 + ... + 778966.

It is an arithmetic number, because the mean of its divisors is an integer number (775414563).

Almost surely, 2^25111412500 is an apocalyptic number.

25111412500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25111412500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27914924268).

25111412500 is an abundant number, since it is smaller than the sum of its proper divisors (30718436036).

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

25111412500 is an equidigital number, since it uses as much as digits as its factorization.

25111412500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33023 (or 33001 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 25111412500 its reverse (521411152), we get a palindrome (25632823652).

The spelling of 25111412500 in words is "twenty-five billion, one hundred eleven million, four hundred twelve thousand, five hundred".