18211260729 has 16 divisors (see below), whose sum is σ = 24782827392. Its totient is φ = 11891063808.

The previous prime is 18211260671. The next prime is 18211260779. The reversal of 18211260729 is 92706211281.

It is not a de Polignac number, because 18211260729 - 2⁷ = 18211260601 is a prime.

It is a super-2 number, since 2×18211260729² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18211260779) 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 in 15 ways as a sum of consecutive naturals, for example, 7509 + ... + 190994.

It is an arithmetic number, because the mean of its divisors is an integer number (1548926712).

Almost surely, 2^18211260729 is an apocalyptic number.

It is an amenable number.

18211260729 is a deficient number, since it is larger than the sum of its proper divisors (6571566663).

18211260729 is a wasteful number, since it uses less digits than its factorization.

18211260729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199136.

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 18211260729 in words is "eighteen billion, two hundred eleven million, two hundred sixty thousand, seven hundred twenty-nine".