25505671538 has 16 divisors (see below), whose sum is σ = 40560025344. Its totient is φ = 12007900080.

The previous prime is 25505671517. The next prime is 25505671643. The reversal of 25505671538 is 83517650552.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25505671492 and 25505671501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5556920 + ... + 5561507.

It is an arithmetic number, because the mean of its divisors is an integer number (2535001584).

Almost surely, 2^25505671538 is an apocalyptic number.

25505671538 is a deficient number, since it is larger than the sum of its proper divisors (15054353806).

25505671538 is a wasteful number, since it uses less digits than its factorization.

25505671538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118497.

The product of its (nonzero) digits is 1260000, while the sum is 47.

The spelling of 25505671538 in words is "twenty-five billion, five hundred five million, six hundred seventy-one thousand, five hundred thirty-eight".