25666411225 has 48 divisors (see below), whose sum is σ = 39201796480. Its totient is φ = 16233177600.

The previous prime is 25666411201. The next prime is 25666411247. The reversal of 25666411225 is 52211466652.

It is a happy number.

It is not a de Polignac number, because 25666411225 - 2⁷ = 25666411097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3479341 + ... + 3486709.

Almost surely, 2^25666411225 is an apocalyptic number.

25666411225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25666411225 is a deficient number, since it is larger than the sum of its proper divisors (13535385255).

25666411225 is a wasteful number, since it uses less digits than its factorization.

25666411225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8930 (or 8925 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

Adding to 25666411225 its reverse (52211466652), we get a palindrome (77877877877).

The spelling of 25666411225 in words is "twenty-five billion, six hundred sixty-six million, four hundred eleven thousand, two hundred twenty-five".