25405440211 has 4 divisors (see below), whose sum is σ = 26510024592. Its totient is φ = 24300855832.

The previous prime is 25405440187. The next prime is 25405440233. The reversal of 25405440211 is 11204450452.

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 25405440211 - 2²¹ = 25403343059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25405440211.

It is not an unprimeable number, because it can be changed into a prime (25405446211) 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, 552292156 + ... + 552292201.

It is an arithmetic number, because the mean of its divisors is an integer number (6627506148).

Almost surely, 2^25405440211 is an apocalyptic number.

25405440211 is a deficient number, since it is larger than the sum of its proper divisors (1104584381).

25405440211 is a wasteful number, since it uses less digits than its factorization.

25405440211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104584380.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 25405440211 its reverse (11204450452), we get a palindrome (36609890663).

The spelling of 25405440211 in words is "twenty-five billion, four hundred five million, four hundred forty thousand, two hundred eleven".