637220571349 has 2 divisors, whose sum is σ = 637220571350. Its totient is φ = 637220571348.

The previous prime is 637220571319. The next prime is 637220571479. The reversal of 637220571349 is 943175022736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 468745622500 + 168474948849 = 684650^2 + 410457^2 .

It is a cyclic number.

It is not a de Polignac number, because 637220571349 - 2⁹ = 637220570837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637220571319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318610285674 + 318610285675.

It is an arithmetic number, because the mean of its divisors is an integer number (318610285675).

Almost surely, 2^637220571349 is an apocalyptic number.

It is an amenable number.

637220571349 is a deficient number, since it is larger than the sum of its proper divisors (1).

637220571349 is an equidigital number, since it uses as much as digits as its factorization.

637220571349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 637220571349 in words is "six hundred thirty-seven billion, two hundred twenty million, five hundred seventy-one thousand, three hundred forty-nine".