18191929100929 has 2 divisors, whose sum is σ = 18191929100930. Its totient is φ = 18191929100928.

The previous prime is 18191929100911. The next prime is 18191929101001. The reversal of 18191929100929 is 92900192919181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14921401529329 + 3270527571600 = 3862823^2 + 1808460^2 .

It is a cyclic number.

It is not a de Polignac number, because 18191929100929 - 2¹³ = 18191929092737 is a prime.

It is not a weakly prime, because it can be changed into another prime (18191929109929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9095964550464 + 9095964550465.

It is an arithmetic number, because the mean of its divisors is an integer number (9095964550465).

Almost surely, 2^{18191929100929} is an apocalyptic number.

It is an amenable number.

18191929100929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18191929100929 is an equidigital number, since it uses as much as digits as its factorization.

18191929100929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 61.

The spelling of 18191929100929 in words is "eighteen trillion, one hundred ninety-one billion, nine hundred twenty-nine million, one hundred thousand, nine hundred twenty-nine".