18351851873 has 2 divisors, whose sum is σ = 18351851874. Its totient is φ = 18351851872.

The previous prime is 18351851831. The next prime is 18351851899. The reversal of 18351851873 is 37815815381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17716408609 + 635443264 = 133103^2 + 25208^2 .

It is a cyclic number.

It is not a de Polignac number, because 18351851873 - 2¹⁰ = 18351850849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18351851813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175925936 + 9175925937.

It is an arithmetic number, because the mean of its divisors is an integer number (9175925937).

Almost surely, 2^18351851873 is an apocalyptic number.

It is an amenable number.

18351851873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351851873 is an equidigital number, since it uses as much as digits as its factorization.

18351851873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 50.

The spelling of 18351851873 in words is "eighteen billion, three hundred fifty-one million, eight hundred fifty-one thousand, eight hundred seventy-three".