2722217605981 has 2 divisors, whose sum is σ = 2722217605982. Its totient is φ = 2722217605980.

The previous prime is 2722217605969. The next prime is 2722217606023. The reversal of 2722217605981 is 1895067122272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2154818484900 + 567399121081 = 1467930^2 + 753259^2 .

It is a cyclic number.

It is not a de Polignac number, because 2722217605981 - 2³⁹ = 2172461792093 is a prime.

It is a super-2 number, since 2×2722217605981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2722217605901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1361108802990 + 1361108802991.

It is an arithmetic number, because the mean of its divisors is an integer number (1361108802991).

Almost surely, 2^{2722217605981} is an apocalyptic number.

It is an amenable number.

2722217605981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2722217605981 is an equidigital number, since it uses as much as digits as its factorization.

2722217605981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 2722217605981 in words is "two trillion, seven hundred twenty-two billion, two hundred seventeen million, six hundred five thousand, nine hundred eighty-one".