25172222011 has 4 divisors (see below), whose sum is σ = 25206564112. Its totient is φ = 25137879912.

The previous prime is 25172221993. The next prime is 25172222017. The reversal of 25172222011 is 11022227152.

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 25172222011 - 2¹⁹ = 25171697723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25172222017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17169951 + ... + 17171416.

It is an arithmetic number, because the mean of its divisors is an integer number (6301641028).

Almost surely, 2^25172222011 is an apocalyptic number.

25172222011 is a deficient number, since it is larger than the sum of its proper divisors (34342101).

25172222011 is an equidigital number, since it uses as much as digits as its factorization.

25172222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34342100.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 25172222011 its reverse (11022227152), we get a palindrome (36194449163).

The spelling of 25172222011 in words is "twenty-five billion, one hundred seventy-two million, two hundred twenty-two thousand, eleven".