11111122222225 has 9 divisors (see below), whose sum is σ = 13777812222267. Its totient is φ = 8888884444440.

The previous prime is 11111122222181. The next prime is 11111122222241. The reversal of 11111122222225 is 52222222111111.

The square root of 11111122222225 is 3333335.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4000004000001 + 7111118222224 = 2000001^2 + 2666668^2 .

It is not a de Polignac number, because 11111122222225 - 2⁹ = 11111122221713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 11111122222225.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16333342 + ... + 17000008.

Almost surely, 2^{11111122222225} is an apocalyptic number.

11111122222225 is the 3333335-th square number.

11111122222225 is the 1666668-th centered octagonal number.

It is an amenable number.

11111122222225 is a deficient number, since it is larger than the sum of its proper divisors (2666690000042).

11111122222225 is an frugal number, since it uses more digits than its factorization.

11111122222225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333344 (or 666672 counting only the distinct ones).

The product of its digits is 640, while the sum is 25.

Multiplying 11111122222225 by its sum of digits (25), we get a square (277778055555625 = 16666675²).

11111122222225 divided by its sum of digits (25) gives a square (444444888889 = 666667²).

Adding to 11111122222225 its reverse (52222222111111), we get a palindrome (63333344333336).

The spelling of 11111122222225 in words is "eleven trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-five".