18750720187 has 2 divisors, whose sum is σ = 18750720188. Its totient is φ = 18750720186.

The previous prime is 18750720179. The next prime is 18750720193. The reversal of 18750720187 is 78102705781.

It is a strong prime.

It is an emirp because it is prime and its reverse (78102705781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18750720187 - 2³ = 18750720179 is a prime.

It is not a weakly prime, because it can be changed into another prime (18750720127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375360093 + 9375360094.

It is an arithmetic number, because the mean of its divisors is an integer number (9375360094).

Almost surely, 2^18750720187 is an apocalyptic number.

18750720187 is a deficient number, since it is larger than the sum of its proper divisors (1).

18750720187 is an equidigital number, since it uses as much as digits as its factorization.

18750720187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 219520, while the sum is 46.

The spelling of 18750720187 in words is "eighteen billion, seven hundred fifty million, seven hundred twenty thousand, one hundred eighty-seven".