18031795729 has 2 divisors, whose sum is σ = 18031795730. Its totient is φ = 18031795728.

The previous prime is 18031795721. The next prime is 18031795759. The reversal of 18031795729 is 92759713081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18031118400 + 677329 = 134280^2 + 823^2 .

It is a cyclic number.

It is not a de Polignac number, because 18031795729 - 2³ = 18031795721 is a prime.

It is not a weakly prime, because it can be changed into another prime (18031795721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9015897864 + 9015897865.

It is an arithmetic number, because the mean of its divisors is an integer number (9015897865).

Almost surely, 2^18031795729 is an apocalyptic number.

It is an amenable number.

18031795729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18031795729 is an equidigital number, since it uses as much as digits as its factorization.

18031795729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 18031795729 in words is "eighteen billion, thirty-one million, seven hundred ninety-five thousand, seven hundred twenty-nine".