25640011 has 4 divisors (see below), whose sum is σ = 25793712. Its totient is φ = 25486312.

The previous prime is 25639981. The next prime is 25640023. The reversal of 25640011 is 11004652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25640011 - 2⁵ = 25639979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76600 + ... + 76933.

It is an arithmetic number, because the mean of its divisors is an integer number (6448428).

Almost surely, 2^25640011 is an apocalyptic number.

25640011 is a deficient number, since it is larger than the sum of its proper divisors (153701).

25640011 is a wasteful number, since it uses less digits than its factorization.

25640011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153700.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 25640011 is about 5063.5966466534. The cubic root of 25640011 is about 294.8759834933.

Adding to 25640011 its reverse (11004652), we get a palindrome (36644663).

The spelling of 25640011 in words is "twenty-five million, six hundred forty thousand, eleven".