2222762121661 has 2 divisors, whose sum is σ = 2222762121662. Its totient is φ = 2222762121660.

The previous prime is 2222762121647. The next prime is 2222762121683. The reversal of 2222762121661 is 1661212672222.

2222762121661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2113403600025 + 109358521636 = 1453755^2 + 330694^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222762121661 - 2¹⁵ = 2222762088893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2222762121631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111381060830 + 1111381060831.

It is an arithmetic number, because the mean of its divisors is an integer number (1111381060831).

Almost surely, 2^{2222762121661} is an apocalyptic number.

It is an amenable number.

2222762121661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222762121661 is an equidigital number, since it uses as much as digits as its factorization.

2222762121661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

Adding to 2222762121661 its reverse (1661212672222), we get a palindrome (3883974793883).

The spelling of 2222762121661 in words is "two trillion, two hundred twenty-two billion, seven hundred sixty-two million, one hundred twenty-one thousand, six hundred sixty-one".