638927099803 has 2 divisors, whose sum is σ = 638927099804. Its totient is φ = 638927099802.

The previous prime is 638927099779. The next prime is 638927099813. The reversal of 638927099803 is 308990729836.

It is a happy number.

638927099803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638927099803 - 2³⁷ = 501488146331 is a prime.

It is not a weakly prime, because it can be changed into another prime (638927099813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319463549901 + 319463549902.

It is an arithmetic number, because the mean of its divisors is an integer number (319463549902).

Almost surely, 2^638927099803 is an apocalyptic number.

638927099803 is a deficient number, since it is larger than the sum of its proper divisors (1).

638927099803 is an equidigital number, since it uses as much as digits as its factorization.

638927099803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 638927099803 in words is "six hundred thirty-eight billion, nine hundred twenty-seven million, ninety-nine thousand, eight hundred three".