25518484499 has 2 divisors, whose sum is σ = 25518484500. Its totient is φ = 25518484498.

The previous prime is 25518484493. The next prime is 25518484517. The reversal of 25518484499 is 99448481552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25518484499 - 2⁴ = 25518484483 is a prime.

It is a super-2 number, since 2×25518484499² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25518484493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759242249 + 12759242250.

It is an arithmetic number, because the mean of its divisors is an integer number (12759242250).

Almost surely, 2^25518484499 is an apocalyptic number.

25518484499 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518484499 is an equidigital number, since it uses as much as digits as its factorization.

25518484499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16588800, while the sum is 59.

The spelling of 25518484499 in words is "twenty-five billion, five hundred eighteen million, four hundred eighty-four thousand, four hundred ninety-nine".