1638090009091 has 2 divisors, whose sum is σ = 1638090009092. Its totient is φ = 1638090009090.

The previous prime is 1638090009013. The next prime is 1638090009167. The reversal of 1638090009091 is 1909000908361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1638090009091 - 2²⁵ = 1638056454659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1638090009991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819045004545 + 819045004546.

It is an arithmetic number, because the mean of its divisors is an integer number (819045004546).

Almost surely, 2^{1638090009091} is an apocalyptic number.

1638090009091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638090009091 is an equidigital number, since it uses as much as digits as its factorization.

1638090009091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 46.

The spelling of 1638090009091 in words is "one trillion, six hundred thirty-eight billion, ninety million, nine thousand, ninety-one".