4220365661 has 2 divisors, whose sum is σ = 4220365662. Its totient is φ = 4220365660.

The previous prime is 4220365649. The next prime is 4220365691. The reversal of 4220365661 is 1665630224.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3560389561 + 659976100 = 59669^2 + 25690^2 .

It is a cyclic number.

It is not a de Polignac number, because 4220365661 - 2¹⁴ = 4220349277 is a prime.

It is a super-2 number, since 2×4220365661² = 35622972625095933842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4220365631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110182830 + 2110182831.

It is an arithmetic number, because the mean of its divisors is an integer number (2110182831).

Almost surely, 2^4220365661 is an apocalyptic number.

It is an amenable number.

4220365661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4220365661 is an equidigital number, since it uses as much as digits as its factorization.

4220365661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 4220365661 is about 64964.3414574488. The cubic root of 4220365661 is about 1616.0322629667.

Adding to 4220365661 its reverse (1665630224), we get a palindrome (5885995885).

The spelling of 4220365661 in words is "four billion, two hundred twenty million, three hundred sixty-five thousand, six hundred sixty-one".