25107420520 has 64 divisors (see below), whose sum is σ = 69528251520. Its totient is φ = 7946083584.

The previous prime is 25107420497. The next prime is 25107420523. The reversal of 25107420520 is 2502470152.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (25107420523) 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, 3445182 + ... + 3452461.

It is an arithmetic number, because the mean of its divisors is an integer number (1086378930).

Almost surely, 2^25107420520 is an apocalyptic number.

25107420520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25107420520 is an abundant number, since it is smaller than the sum of its proper divisors (44420831000).

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

25107420520 is a wasteful number, since it uses less digits than its factorization.

25107420520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6897674 (or 6897670 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

Adding to 25107420520 its reverse (2502470152), we get a palindrome (27609890672).

The spelling of 25107420520 in words is "twenty-five billion, one hundred seven million, four hundred twenty thousand, five hundred twenty".