25506515287 has 48 divisors (see below), whose sum is σ = 30070065760. Its totient is φ = 21614947200.

The previous prime is 25506515197. The next prime is 25506515297. The reversal of 25506515287 is 78251560552.

It is not a de Polignac number, because 25506515287 - 2²³ = 25498126679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25506515297) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60585337 + ... + 60585757.

Almost surely, 2^25506515287 is an apocalyptic number.

25506515287 is a deficient number, since it is larger than the sum of its proper divisors (4563550473).

25506515287 is an equidigital number, since it uses as much as digits as its factorization.

25506515287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 46.

The spelling of 25506515287 in words is "twenty-five billion, five hundred six million, five hundred fifteen thousand, two hundred eighty-seven".