25356109249 has 12 divisors (see below), whose sum is σ = 26041966020. Its totient is φ = 24673626240.

The previous prime is 25356109241. The next prime is 25356109253. The reversal of 25356109249 is 94290165352.

It can be written as a sum of positive squares in 2 ways, for example, as 6595876225 + 18760233024 = 81215^2 + 136968^2 .

It is not a de Polignac number, because 25356109249 - 2³ = 25356109241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25356109199 and 25356109208.

It is not an unprimeable number, because it can be changed into a prime (25356109241) 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, 7899957 + ... + 7903165.

It is an arithmetic number, because the mean of its divisors is an integer number (2170163835).

Almost surely, 2^25356109249 is an apocalyptic number.

It is an amenable number.

25356109249 is a deficient number, since it is larger than the sum of its proper divisors (685856771).

25356109249 is an frugal number, since it uses more digits than its factorization.

25356109249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128 (or 3689 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 25356109249 in words is "twenty-five billion, three hundred fifty-six million, one hundred nine thousand, two hundred forty-nine".