220644863437 has 2 divisors, whose sum is σ = 220644863438. Its totient is φ = 220644863436.

The previous prime is 220644863359. The next prime is 220644863503. The reversal of 220644863437 is 734368446022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160279321801 + 60365541636 = 400349^2 + 245694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220644863437 is a prime.

It is a super-2 number, since 2×220644863437² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220644803437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110322431718 + 110322431719.

It is an arithmetic number, because the mean of its divisors is an integer number (110322431719).

Almost surely, 2^220644863437 is an apocalyptic number.

It is an amenable number.

220644863437 is a deficient number, since it is larger than the sum of its proper divisors (1).

220644863437 is an equidigital number, since it uses as much as digits as its factorization.

220644863437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4644864, while the sum is 49.

The spelling of 220644863437 in words is "two hundred twenty billion, six hundred forty-four million, eight hundred sixty-three thousand, four hundred thirty-seven".