216290580169861 has 2 divisors, whose sum is σ = 216290580169862. Its totient is φ = 216290580169860.

The previous prime is 216290580169583. The next prime is 216290580169897. The reversal of 216290580169861 is 168961085092612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194669884332225 + 21620695837636 = 13952415^2 + 4649806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216290580169861 is a prime.

It is a super-2 number, since 2×216290580169861² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216290580169793 and 216290580169802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216290580139861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108145290084930 + 108145290084931.

It is an arithmetic number, because the mean of its divisors is an integer number (108145290084931).

Almost surely, 2^{216290580169861} is an apocalyptic number.

It is an amenable number.

216290580169861 is a deficient number, since it is larger than the sum of its proper divisors (1).

216290580169861 is an equidigital number, since it uses as much as digits as its factorization.

216290580169861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22394880, while the sum is 64.

The spelling of 216290580169861 in words is "two hundred sixteen trillion, two hundred ninety billion, five hundred eighty million, one hundred sixty-nine thousand, eight hundred sixty-one".