25978285999 has 2 divisors, whose sum is σ = 25978286000. Its totient is φ = 25978285998.

The previous prime is 25978285997. The next prime is 25978286003. The reversal of 25978285999 is 99958287952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25978285999 - 2¹ = 25978285997 is a prime.

Together with 25978285997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25978285997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12989142999 + 12989143000.

It is an arithmetic number, because the mean of its divisors is an integer number (12989143000).

Almost surely, 2^25978285999 is an apocalyptic number.

25978285999 is a deficient number, since it is larger than the sum of its proper divisors (1).

25978285999 is an equidigital number, since it uses as much as digits as its factorization.

25978285999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 293932800, while the sum is 73.

The spelling of 25978285999 in words is "twenty-five billion, nine hundred seventy-eight million, two hundred eighty-five thousand, nine hundred ninety-nine".