222221777749 has 2 divisors, whose sum is σ = 222221777750. Its totient is φ = 222221777748.

The previous prime is 222221777681. The next prime is 222221777783. The reversal of 222221777749 is 947777122222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115647604900 + 106574172849 = 340070^2 + 326457^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221777749 - 2²⁷ = 222087560021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221777696 and 222221777705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222221777549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110888874 + 111110888875.

It is an arithmetic number, because the mean of its divisors is an integer number (111110888875).

Almost surely, 2^222221777749 is an apocalyptic number.

It is an amenable number.

222221777749 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221777749 is an equidigital number, since it uses as much as digits as its factorization.

222221777749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 52.

It can be divided in two parts, 22222 and 1777749, that added together give a palindrome (1799971).

The spelling of 222221777749 in words is "two hundred twenty-two billion, two hundred twenty-one million, seven hundred seventy-seven thousand, seven hundred forty-nine".