18233920729 has 2 divisors, whose sum is σ = 18233920730. Its totient is φ = 18233920728.

The previous prime is 18233920709. The next prime is 18233920807. The reversal of 18233920729 is 92702933281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18192614400 + 41306329 = 134880^2 + 6427^2 .

It is a cyclic number.

It is not a de Polignac number, because 18233920729 - 2⁵ = 18233920697 is a prime.

It is not a weakly prime, because it can be changed into another prime (18233920709) 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, 9116960364 + 9116960365.

It is an arithmetic number, because the mean of its divisors is an integer number (9116960365).

Almost surely, 2^18233920729 is an apocalyptic number.

It is an amenable number.

18233920729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18233920729 is an equidigital number, since it uses as much as digits as its factorization.

18233920729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 18233920729 in words is "eighteen billion, two hundred thirty-three million, nine hundred twenty thousand, seven hundred twenty-nine".