639746322022273 has 2 divisors, whose sum is σ = 639746322022274. Its totient is φ = 639746322022272.

The previous prime is 639746322022271. The next prime is 639746322022303. The reversal of 639746322022273 is 372220223647936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404686125043344 + 235060196978929 = 20116812^2 + 15331673^2 .

It is a cyclic number.

It is not a de Polignac number, because 639746322022273 - 2¹ = 639746322022271 is a prime.

Together with 639746322022271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (639746322022271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319873161011136 + 319873161011137.

It is an arithmetic number, because the mean of its divisors is an integer number (319873161011137).

Almost surely, 2^{639746322022273} is an apocalyptic number.

It is an amenable number.

639746322022273 is a deficient number, since it is larger than the sum of its proper divisors (1).

639746322022273 is an equidigital number, since it uses as much as digits as its factorization.

639746322022273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54867456, while the sum is 58.

The spelling of 639746322022273 in words is "six hundred thirty-nine trillion, seven hundred forty-six billion, three hundred twenty-two million, twenty-two thousand, two hundred seventy-three".