25516420867 has 12 divisors (see below), whose sum is σ = 29694148176. Its totient is φ = 21862537200.

The previous prime is 25516420843. The next prime is 25516420921. The reversal of 25516420867 is 76802461552.

It is a de Polignac number, because none of the positive numbers 2^k-25516420867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25516420067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22933 + ... + 227065.

It is an arithmetic number, because the mean of its divisors is an integer number (2474512348).

Almost surely, 2^25516420867 is an apocalyptic number.

25516420867 is a deficient number, since it is larger than the sum of its proper divisors (4177727309).

25516420867 is a wasteful number, since it uses less digits than its factorization.

25516420867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206698 (or 206691 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 25516420867 in words is "twenty-five billion, five hundred sixteen million, four hundred twenty thousand, eight hundred sixty-seven".