18489267193729 has 2 divisors, whose sum is σ = 18489267193730. Its totient is φ = 18489267193728.

The previous prime is 18489267193697. The next prime is 18489267193739. The reversal of 18489267193729 is 92739176298481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14358210943729 + 4131056250000 = 3789223^2 + 2032500^2 .

It is a cyclic number.

It is not a de Polignac number, because 18489267193729 - 2⁵ = 18489267193697 is a prime.

It is a super-2 number, since 2×18489267193729² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18489267193739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9244633596864 + 9244633596865.

It is an arithmetic number, because the mean of its divisors is an integer number (9244633596865).

Almost surely, 2^{18489267193729} is an apocalyptic number.

It is an amenable number.

18489267193729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18489267193729 is an equidigital number, since it uses as much as digits as its factorization.

18489267193729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658409472, while the sum is 76.

The spelling of 18489267193729 in words is "eighteen trillion, four hundred eighty-nine billion, two hundred sixty-seven million, one hundred ninety-three thousand, seven hundred twenty-nine".