25513531487 has 2 divisors, whose sum is σ = 25513531488. Its totient is φ = 25513531486.

The previous prime is 25513531481. The next prime is 25513531513. The reversal of 25513531487 is 78413531552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25513531487 - 2¹⁴ = 25513515103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25513531481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12756765743 + 12756765744.

It is an arithmetic number, because the mean of its divisors is an integer number (12756765744).

Almost surely, 2^25513531487 is an apocalyptic number.

25513531487 is a deficient number, since it is larger than the sum of its proper divisors (1).

25513531487 is an equidigital number, since it uses as much as digits as its factorization.

25513531487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 44.

The spelling of 25513531487 in words is "twenty-five billion, five hundred thirteen million, five hundred thirty-one thousand, four hundred eighty-seven".