25252521240 has 64 divisors (see below), whose sum is σ = 76259324160. Its totient is φ = 6689404800.

The previous prime is 25252521221. The next prime is 25252521241. The reversal of 25252521240 is 4212525252.

It is a super-2 number, since 2×25252521240² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25252521198 and 25252521207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25252521241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 678694 + ... + 714933.

It is an arithmetic number, because the mean of its divisors is an integer number (1191551940).

Almost surely, 2^25252521240 is an apocalyptic number.

25252521240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25252521240 is an abundant number, since it is smaller than the sum of its proper divisors (51006802920).

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

25252521240 is a wasteful number, since it uses less digits than its factorization.

25252521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393792 (or 1393788 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

It can be divided in two parts, 252525212 and 40, that added together give a palindrome (252525252).

The spelling of 25252521240 in words is "twenty-five billion, two hundred fifty-two million, five hundred twenty-one thousand, two hundred forty".