18367272709 has 2 divisors, whose sum is σ = 18367272710. Its totient is φ = 18367272708.

The previous prime is 18367272689. The next prime is 18367272727. The reversal of 18367272709 is 90727276381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18308796100 + 58476609 = 135310^2 + 7647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18367272709 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18367272809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183636354 + 9183636355.

It is an arithmetic number, because the mean of its divisors is an integer number (9183636355).

Almost surely, 2^18367272709 is an apocalyptic number.

It is an amenable number.

18367272709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18367272709 is an equidigital number, since it uses as much as digits as its factorization.

18367272709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 18367272709 in words is "eighteen billion, three hundred sixty-seven million, two hundred seventy-two thousand, seven hundred nine".