18750720193 has 2 divisors, whose sum is σ = 18750720194. Its totient is φ = 18750720192.

The previous prime is 18750720187. The next prime is 18750720259. The reversal of 18750720193 is 39102705781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18567605169 + 183115024 = 136263^2 + 13532^2 .

It is an emirp because it is prime and its reverse (39102705781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18750720193 - 2²¹ = 18748623041 is a prime.

It is not a weakly prime, because it can be changed into another prime (18750720143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375360096 + 9375360097.

It is an arithmetic number, because the mean of its divisors is an integer number (9375360097).

Almost surely, 2^18750720193 is an apocalyptic number.

It is an amenable number.

18750720193 is a deficient number, since it is larger than the sum of its proper divisors (1).

18750720193 is an equidigital number, since it uses as much as digits as its factorization.

18750720193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 18750720193 in words is "eighteen billion, seven hundred fifty million, seven hundred twenty thousand, one hundred ninety-three".