638927095843 has 2 divisors, whose sum is σ = 638927095844. Its totient is φ = 638927095842.

The previous prime is 638927095799. The next prime is 638927095847. The reversal of 638927095843 is 348590729836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638927095843 is a prime.

It is not a weakly prime, because it can be changed into another prime (638927095847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319463547921 + 319463547922.

It is an arithmetic number, because the mean of its divisors is an integer number (319463547922).

Almost surely, 2^638927095843 is an apocalyptic number.

638927095843 is a deficient number, since it is larger than the sum of its proper divisors (1).

638927095843 is an equidigital number, since it uses as much as digits as its factorization.

638927095843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 638927095843 in words is "six hundred thirty-eight billion, nine hundred twenty-seven million, ninety-five thousand, eight hundred forty-three".