638453444011 has 2 divisors, whose sum is σ = 638453444012. Its totient is φ = 638453444010.

The previous prime is 638453444003. The next prime is 638453444021. The reversal of 638453444011 is 110444354836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638453444011 - 2³ = 638453444003 is a prime.

It is a super-2 number, since 2×638453444011² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638453444021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319226722005 + 319226722006.

It is an arithmetic number, because the mean of its divisors is an integer number (319226722006).

Almost surely, 2^638453444011 is an apocalyptic number.

638453444011 is a deficient number, since it is larger than the sum of its proper divisors (1).

638453444011 is an equidigital number, since it uses as much as digits as its factorization.

638453444011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 43.

Adding to 638453444011 its reverse (110444354836), we get a palindrome (748897798847).

The spelling of 638453444011 in words is "six hundred thirty-eight billion, four hundred fifty-three million, four hundred forty-four thousand, eleven".