18921036679 has 2 divisors, whose sum is σ = 18921036680. Its totient is φ = 18921036678.

The previous prime is 18921036677. The next prime is 18921036731. The reversal of 18921036679 is 97663012981.

It is a happy number.

It is an a-pointer prime, because the next prime (18921036731) can be obtained adding 18921036679 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18921036679 - 2¹ = 18921036677 is a prime.

Together with 18921036677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18921036677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460518339 + 9460518340.

It is an arithmetic number, because the mean of its divisors is an integer number (9460518340).

Almost surely, 2^18921036679 is an apocalyptic number.

18921036679 is a deficient number, since it is larger than the sum of its proper divisors (1).

18921036679 is an equidigital number, since it uses as much as digits as its factorization.

18921036679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 18921036679 in words is "eighteen billion, nine hundred twenty-one million, thirty-six thousand, six hundred seventy-nine".