25665850427 has 16 divisors (see below), whose sum is σ = 31164791040. Its totient is φ = 20646651168.

The previous prime is 25665850423. The next prime is 25665850439. The reversal of 25665850427 is 72405856652.

It is a cyclic number.

It is not a de Polignac number, because 25665850427 - 2² = 25665850423 is a prime.

It is a super-2 number, since 2×25665850427² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (25665850423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 887528 + ... + 915989.

It is an arithmetic number, because the mean of its divisors is an integer number (1947799440).

Almost surely, 2^25665850427 is an apocalyptic number.

25665850427 is a deficient number, since it is larger than the sum of its proper divisors (5498940613).

25665850427 is a wasteful number, since it uses less digits than its factorization.

25665850427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803650.

The product of its (nonzero) digits is 4032000, while the sum is 50.

The spelling of 25665850427 in words is "twenty-five billion, six hundred sixty-five million, eight hundred fifty thousand, four hundred twenty-seven".