25666121 has 16 divisors (see below), whose sum is σ = 28459200. Its totient is φ = 23001408.

The previous prime is 25666117. The next prime is 25666127. The reversal of 25666121 is 12166652.

It is a cyclic number.

It is not a de Polignac number, because 25666121 - 2² = 25666117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25666127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83450 + ... + 83756.

It is an arithmetic number, because the mean of its divisors is an integer number (1778700).

Almost surely, 2^25666121 is an apocalyptic number.

It is an amenable number.

25666121 is a deficient number, since it is larger than the sum of its proper divisors (2793079).

25666121 is a wasteful number, since it uses less digits than its factorization.

25666121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488.

The product of its digits is 4320, while the sum is 29.

The square root of 25666121 is about 5066.1741975578. The cubic root of 25666121 is about 294.9760432523.

The spelling of 25666121 in words is "twenty-five million, six hundred sixty-six thousand, one hundred twenty-one".