220371868781 has 2 divisors, whose sum is σ = 220371868782. Its totient is φ = 220371868780.

The previous prime is 220371868693. The next prime is 220371868859. The reversal of 220371868781 is 187868173022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134035799881 + 86336068900 = 366109^2 + 293830^2 .

It is a cyclic number.

It is not a de Polignac number, because 220371868781 - 2³⁴ = 203191999597 is a prime.

It is a super-3 number, since 3×220371868781³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220374868781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110185934390 + 110185934391.

It is an arithmetic number, because the mean of its divisors is an integer number (110185934391).

Almost surely, 2^220371868781 is an apocalyptic number.

It is an amenable number.

220371868781 is a deficient number, since it is larger than the sum of its proper divisors (1).

220371868781 is an equidigital number, since it uses as much as digits as its factorization.

220371868781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 220371868781 in words is "two hundred twenty billion, three hundred seventy-one million, eight hundred sixty-eight thousand, seven hundred eighty-one".