25951887489 has 24 divisors (see below), whose sum is σ = 40271484960. Its totient is φ = 14803212160.

The previous prime is 25951887487. The next prime is 25951887497. The reversal of 25951887489 is 98478815952.

It is not a de Polignac number, because 25951887489 - 2¹ = 25951887487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25951887487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2096559 + ... + 2108900.

It is an arithmetic number, because the mean of its divisors is an integer number (1677978540).

Almost surely, 2^25951887489 is an apocalyptic number.

It is an amenable number.

25951887489 is a deficient number, since it is larger than the sum of its proper divisors (14319597471).

25951887489 is a wasteful number, since it uses less digits than its factorization.

25951887489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205501 (or 4205490 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 66.

The spelling of 25951887489 in words is "twenty-five billion, nine hundred fifty-one million, eight hundred eighty-seven thousand, four hundred eighty-nine".