22221818551 has 2 divisors, whose sum is σ = 22221818552. Its totient is φ = 22221818550.

The previous prime is 22221818539. The next prime is 22221818599. The reversal of 22221818551 is 15581812222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22221818551 - 2⁵ = 22221818519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22221818551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221818051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110909275 + 11110909276.

It is an arithmetic number, because the mean of its divisors is an integer number (11110909276).

Almost surely, 2^22221818551 is an apocalyptic number.

22221818551 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221818551 is an equidigital number, since it uses as much as digits as its factorization.

22221818551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 37.

The spelling of 22221818551 in words is "twenty-two billion, two hundred twenty-one million, eight hundred eighteen thousand, five hundred fifty-one".