25891817492 has 6 divisors (see below), whose sum is σ = 45310680618. Its totient is φ = 12945908744.

The previous prime is 25891817477. The next prime is 25891817509. The reversal of 25891817492 is 29471819852.

It can be written as a sum of positive squares in only one way, i.e., 16326195076 + 9565622416 = 127774^2 + 97804^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3236477183 + ... + 3236477190.

It is an arithmetic number, because the mean of its divisors is an integer number (7551780103).

Almost surely, 2^25891817492 is an apocalyptic number.

It is an amenable number.

25891817492 is a deficient number, since it is larger than the sum of its proper divisors (19418863126).

25891817492 is a wasteful number, since it uses less digits than its factorization.

25891817492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472954377 (or 6472954375 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 56.

The spelling of 25891817492 in words is "twenty-five billion, eight hundred ninety-one million, eight hundred seventeen thousand, four hundred ninety-two".