18601151993 has 2 divisors, whose sum is σ = 18601151994. Its totient is φ = 18601151992.

The previous prime is 18601151903. The next prime is 18601151999. The reversal of 18601151993 is 39915110681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17142141184 + 1459010809 = 130928^2 + 38197^2 .

It is a cyclic number.

It is not a de Polignac number, because 18601151993 - 2²² = 18596957689 is a prime.

It is not a weakly prime, because it can be changed into another prime (18601151999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9300575996 + 9300575997.

It is an arithmetic number, because the mean of its divisors is an integer number (9300575997).

Almost surely, 2^18601151993 is an apocalyptic number.

It is an amenable number.

18601151993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18601151993 is an equidigital number, since it uses as much as digits as its factorization.

18601151993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 44.

The spelling of 18601151993 in words is "eighteen billion, six hundred one million, one hundred fifty-one thousand, nine hundred ninety-three".