638842604611 has 2 divisors, whose sum is σ = 638842604612. Its totient is φ = 638842604610.

The previous prime is 638842604539. The next prime is 638842604641. The reversal of 638842604611 is 116406248836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638842604611 - 2¹⁹ = 638842080323 is a prime.

It is a super-2 number, since 2×638842604611² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638842604641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319421302305 + 319421302306.

It is an arithmetic number, because the mean of its divisors is an integer number (319421302306).

Almost surely, 2^638842604611 is an apocalyptic number.

638842604611 is a deficient number, since it is larger than the sum of its proper divisors (1).

638842604611 is an equidigital number, since it uses as much as digits as its factorization.

638842604611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 638842604611 in words is "six hundred thirty-eight billion, eight hundred forty-two million, six hundred four thousand, six hundred eleven".