18131040673 has 2 divisors, whose sum is σ = 18131040674. Its totient is φ = 18131040672.

The previous prime is 18131040661. The next prime is 18131040677. The reversal of 18131040673 is 37604013181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17982005409 + 149035264 = 134097^2 + 12208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18131040673 is a prime.

It is not a weakly prime, because it can be changed into another prime (18131040677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9065520336 + 9065520337.

It is an arithmetic number, because the mean of its divisors is an integer number (9065520337).

Almost surely, 2^18131040673 is an apocalyptic number.

It is an amenable number.

18131040673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18131040673 is an equidigital number, since it uses as much as digits as its factorization.

18131040673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 18131040673 in words is "eighteen billion, one hundred thirty-one million, forty thousand, six hundred seventy-three".