25515201020 has 12 divisors (see below), whose sum is σ = 53581922184. Its totient is φ = 10206080400.

The previous prime is 25515201013. The next prime is 25515201113. The reversal of 25515201020 is 2010251552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637880006 + ... + 637880045.

It is an arithmetic number, because the mean of its divisors is an integer number (4465160182).

Almost surely, 2^25515201020 is an apocalyptic number.

25515201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25515201020 is an abundant number, since it is smaller than the sum of its proper divisors (28066721164).

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

25515201020 is a wasteful number, since it uses less digits than its factorization.

25515201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275760060 (or 1275760058 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 25515201020 its reverse (2010251552), we get a palindrome (27525452572).

The spelling of 25515201020 in words is "twenty-five billion, five hundred fifteen million, two hundred one thousand, twenty".