220516051661 has 2 divisors, whose sum is σ = 220516051662. Its totient is φ = 220516051660.

The previous prime is 220516051643. The next prime is 220516051703. The reversal of 220516051661 is 166150615022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187321033636 + 33195018025 = 432806^2 + 182195^2 .

It is a cyclic number.

It is not a de Polignac number, because 220516051661 - 2⁶ = 220516051597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220516051621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110258025830 + 110258025831.

It is an arithmetic number, because the mean of its divisors is an integer number (110258025831).

Almost surely, 2^220516051661 is an apocalyptic number.

It is an amenable number.

220516051661 is a deficient number, since it is larger than the sum of its proper divisors (1).

220516051661 is an equidigital number, since it uses as much as digits as its factorization.

220516051661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 220516051661 its reverse (166150615022), we get a palindrome (386666666683).

The spelling of 220516051661 in words is "two hundred twenty billion, five hundred sixteen million, fifty-one thousand, six hundred sixty-one".