25591138551 has 96 divisors (see below), whose sum is σ = 44500135680. Its totient is φ = 13999910400.

The previous prime is 25591138499. The next prime is 25591138597. The reversal of 25591138551 is 15583119552.

25591138551 is a `hidden beast` number, since 2 + 5 + 5 + 91 + 1 + 3 + 8 + 551 = 666.

It is not a de Polignac number, because 25591138551 - 2²¹ = 25589041399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25591138497 and 25591138506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25591138051) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3312345 + ... + 3320061.

It is an arithmetic number, because the mean of its divisors is an integer number (463543080).

Almost surely, 2^25591138551 is an apocalyptic number.

25591138551 is a deficient number, since it is larger than the sum of its proper divisors (18908997129).

25591138551 is a wasteful number, since it uses less digits than its factorization.

25591138551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7837 (or 7834 counting only the distinct ones).

The product of its digits is 270000, while the sum is 45.

The spelling of 25591138551 in words is "twenty-five billion, five hundred ninety-one million, one hundred thirty-eight thousand, five hundred fifty-one".