25215033520 has 40 divisors (see below), whose sum is σ = 58730307984. Its totient is φ = 10067887872.

The previous prime is 25215033509. The next prime is 25215033521. The reversal of 25215033520 is 2533051252.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (25215033521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238374 + ... + 327493.

Almost surely, 2^25215033520 is an apocalyptic number.

25215033520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25215033520 is an abundant number, since it is smaller than the sum of its proper divisors (33515274464).

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

25215033520 is a wasteful number, since it uses less digits than its factorization.

25215033520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566437 (or 566431 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 25215033520 its reverse (2533051252), we get a palindrome (27748084772).

The spelling of 25215033520 in words is "twenty-five billion, two hundred fifteen million, thirty-three thousand, five hundred twenty".