18729934401979 has 2 divisors, whose sum is σ = 18729934401980. Its totient is φ = 18729934401978.

The previous prime is 18729934401923. The next prime is 18729934402073. The reversal of 18729934401979 is 97910443992781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18729934401979 - 2⁹ = 18729934401467 is a prime.

It is not a weakly prime, because it can be changed into another prime (18729934501979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364967200989 + 9364967200990.

It is an arithmetic number, because the mean of its divisors is an integer number (9364967200990).

Almost surely, 2^{18729934401979} is an apocalyptic number.

18729934401979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18729934401979 is an equidigital number, since it uses as much as digits as its factorization.

18729934401979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246903552, while the sum is 73.

The spelling of 18729934401979 in words is "eighteen trillion, seven hundred twenty-nine billion, nine hundred thirty-four million, four hundred one thousand, nine hundred seventy-nine".