18827476396109 has 2 divisors, whose sum is σ = 18827476396110. Its totient is φ = 18827476396108.

The previous prime is 18827476396093. The next prime is 18827476396117. The reversal of 18827476396109 is 90169367472881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15752286277225 + 3075190118884 = 3968915^2 + 1753622^2 .

It is a cyclic number.

It is not a de Polignac number, because 18827476396109 - 2⁴ = 18827476396093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18827476396189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9413738198054 + 9413738198055.

It is an arithmetic number, because the mean of its divisors is an integer number (9413738198055).

Almost surely, 2^{18827476396109} is an apocalyptic number.

It is an amenable number.

18827476396109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18827476396109 is an equidigital number, since it uses as much as digits as its factorization.

18827476396109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 219469824, while the sum is 71.

The spelling of 18827476396109 in words is "eighteen trillion, eight hundred twenty-seven billion, four hundred seventy-six million, three hundred ninety-six thousand, one hundred nine".