19291818190993 has 2 divisors, whose sum is σ = 19291818190994. Its totient is φ = 19291818190992.

The previous prime is 19291818190991. The next prime is 19291818191033. The reversal of 19291818190993 is 39909181819291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19232504998144 + 59313192849 = 4385488^2 + 243543^2 .

It is a cyclic number.

It is not a de Polignac number, because 19291818190993 - 2¹ = 19291818190991 is a prime.

It is a super-2 number, since 2×19291818190993² (a number of 27 digits) contains 22 as substring.

Together with 19291818190991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19291818190991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9645909095496 + 9645909095497.

It is an arithmetic number, because the mean of its divisors is an integer number (9645909095497).

Almost surely, 2^{19291818190993} is an apocalyptic number.

It is an amenable number.

19291818190993 is a deficient number, since it is larger than the sum of its proper divisors (1).

19291818190993 is an equidigital number, since it uses as much as digits as its factorization.

19291818190993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22674816, while the sum is 70.

The spelling of 19291818190993 in words is "nineteen trillion, two hundred ninety-one billion, eight hundred eighteen million, one hundred ninety thousand, nine hundred ninety-three".