220640664637 has 2 divisors, whose sum is σ = 220640664638. Its totient is φ = 220640664636.

The previous prime is 220640664593. The next prime is 220640664653. The reversal of 220640664637 is 736466046022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186307909956 + 34332754681 = 431634^2 + 185291^2 .

It is a cyclic number.

It is not a de Polignac number, because 220640664637 - 2¹¹ = 220640662589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220640664667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110320332318 + 110320332319.

It is an arithmetic number, because the mean of its divisors is an integer number (110320332319).

Almost surely, 2^220640664637 is an apocalyptic number.

It is an amenable number.

220640664637 is a deficient number, since it is larger than the sum of its proper divisors (1).

220640664637 is an equidigital number, since it uses as much as digits as its factorization.

220640664637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 46.

The spelling of 220640664637 in words is "two hundred twenty billion, six hundred forty million, six hundred sixty-four thousand, six hundred thirty-seven".