25220136487 has 24 divisors (see below), whose sum is σ = 31620750000. Its totient is φ = 19937788416.

The previous prime is 25220136451. The next prime is 25220136499. The reversal of 25220136487 is 78463102252.

It is not a de Polignac number, because 25220136487 - 2¹⁵ = 25220103719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220136587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 779764 + ... + 811462.

It is an arithmetic number, because the mean of its divisors is an integer number (1317531250).

Almost surely, 2^25220136487 is an apocalyptic number.

25220136487 is a deficient number, since it is larger than the sum of its proper divisors (6400613513).

25220136487 is a wasteful number, since it uses less digits than its factorization.

25220136487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32975 (or 32968 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 25220136487 in words is "twenty-five billion, two hundred twenty million, one hundred thirty-six thousand, four hundred eighty-seven".