18391614673 has 2 divisors, whose sum is σ = 18391614674. Its totient is φ = 18391614672.

The previous prime is 18391614653. The next prime is 18391614701. The reversal of 18391614673 is 37641619381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10357539984 + 8034074689 = 101772^2 + 89633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18391614673 is a prime.

It is not a weakly prime, because it can be changed into another prime (18391614653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9195807336 + 9195807337.

It is an arithmetic number, because the mean of its divisors is an integer number (9195807337).

Almost surely, 2^18391614673 is an apocalyptic number.

It is an amenable number.

18391614673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18391614673 is an equidigital number, since it uses as much as digits as its factorization.

18391614673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The spelling of 18391614673 in words is "eighteen billion, three hundred ninety-one million, six hundred fourteen thousand, six hundred seventy-three".