25021440520 has 16 divisors (see below), whose sum is σ = 56298241260. Its totient is φ = 10008576192.

The previous prime is 25021440481. The next prime is 25021440523. The reversal of 25021440520 is 2504412052.

It can be written as a sum of positive squares in 2 ways, for example, as 21554350596 + 3467089924 = 146814^2 + 58882^2 .

It is not an unprimeable number, because it can be changed into a prime (25021440523) 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, 312767967 + ... + 312768046.

Almost surely, 2^25021440520 is an apocalyptic number.

25021440520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25021440520 is an abundant number, since it is smaller than the sum of its proper divisors (31276800740).

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

25021440520 is a wasteful number, since it uses less digits than its factorization.

25021440520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625536024 (or 625536020 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 25021440520 its reverse (2504412052), we get a palindrome (27525852572).

The spelling of 25021440520 in words is "twenty-five billion, twenty-one million, four hundred forty thousand, five hundred twenty".