18809926388651 has 2 divisors, whose sum is σ = 18809926388652. Its totient is φ = 18809926388650.

The previous prime is 18809926388633. The next prime is 18809926388681. The reversal of 18809926388651 is 15688362990881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18809926388651 - 2²² = 18809922194347 is a prime.

It is not a weakly prime, because it can be changed into another prime (18809926388681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9404963194325 + 9404963194326.

It is an arithmetic number, because the mean of its divisors is an integer number (9404963194326).

Almost surely, 2^{18809926388651} is an apocalyptic number.

18809926388651 is a deficient number, since it is larger than the sum of its proper divisors (1).

18809926388651 is an equidigital number, since it uses as much as digits as its factorization.

18809926388651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 358318080, while the sum is 74.

The spelling of 18809926388651 in words is "eighteen trillion, eight hundred nine billion, nine hundred twenty-six million, three hundred eighty-eight thousand, six hundred fifty-one".