25609472991 has 6 divisors (see below), whose sum is σ = 36991461000. Its totient is φ = 17072981988.

The previous prime is 25609472963. The next prime is 25609473011. The reversal of 25609472991 is 19927490652.

25609472991 is a `hidden beast` number, since 2 + 5 + 609 + 4 + 7 + 29 + 9 + 1 = 666.

It is not a de Polignac number, because 25609472991 - 2⁶ = 25609472927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25609472921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1422748491 + ... + 1422748508.

It is an arithmetic number, because the mean of its divisors is an integer number (6165243500).

Almost surely, 2^25609472991 is an apocalyptic number.

25609472991 is a deficient number, since it is larger than the sum of its proper divisors (11381988009).

25609472991 is a wasteful number, since it uses less digits than its factorization.

25609472991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2845497005 (or 2845497002 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 25609472991 in words is "twenty-five billion, six hundred nine million, four hundred seventy-two thousand, nine hundred ninety-one".