25211664211 has 4 divisors (see below), whose sum is σ = 25265651112. Its totient is φ = 25157677312.

The previous prime is 25211664209. The next prime is 25211664223. The reversal of 25211664211 is 11246611252.

It is a happy number.

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 25211664211 - 2¹ = 25211664209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25211664811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26992750 + ... + 26993683.

It is an arithmetic number, because the mean of its divisors is an integer number (6316412778).

Almost surely, 2^25211664211 is an apocalyptic number.

25211664211 is a deficient number, since it is larger than the sum of its proper divisors (53986901).

25211664211 is an equidigital number, since it uses as much as digits as its factorization.

25211664211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53986900.

The product of its digits is 5760, while the sum is 31.

The spelling of 25211664211 in words is "twenty-five billion, two hundred eleven million, six hundred sixty-four thousand, two hundred eleven".