7217020660061 has 2 divisors, whose sum is σ = 7217020660062. Its totient is φ = 7217020660060.

The previous prime is 7217020660019. The next prime is 7217020660079. The reversal of 7217020660061 is 1600660207127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5572342657561 + 1644678002500 = 2360581^2 + 1282450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7217020660061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7217020659997 and 7217020660024.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7217020860061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3608510330030 + 3608510330031.

It is an arithmetic number, because the mean of its divisors is an integer number (3608510330031).

Almost surely, 2^{7217020660061} is an apocalyptic number.

It is an amenable number.

7217020660061 is a deficient number, since it is larger than the sum of its proper divisors (1).

7217020660061 is an equidigital number, since it uses as much as digits as its factorization.

7217020660061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

Adding to 7217020660061 its reverse (1600660207127), we get a palindrome (8817680867188).

The spelling of 7217020660061 in words is "seven trillion, two hundred seventeen billion, twenty million, six hundred sixty thousand, sixty-one".