25205115136 has 36 divisors (see below), whose sum is σ = 51671569852. Its totient is φ = 12261943296.

The previous prime is 25205115079. The next prime is 25205115137. The reversal of 25205115136 is 63151150252.

It can be written as a sum of positive squares in 2 ways, for example, as 13999622400 + 11205492736 = 118320^2 + 105856^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 25205115098 and 25205115107.

It is not an unprimeable number, because it can be changed into a prime (25205115137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321035 + ... + 1339978.

Almost surely, 2^25205115136 is an apocalyptic number.

It is an amenable number.

25205115136 is an abundant number, since it is smaller than the sum of its proper divisors (26466454716).

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

25205115136 is an equidigital number, since it uses as much as digits as its factorization.

25205115136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661066 (or 2661052 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 25205115136 its reverse (63151150252), we get a palindrome (88356265388).

The spelling of 25205115136 in words is "twenty-five billion, two hundred five million, one hundred fifteen thousand, one hundred thirty-six".