18620350993 has 2 divisors, whose sum is σ = 18620350994. Its totient is φ = 18620350992.

The previous prime is 18620350951. The next prime is 18620351093. The reversal of 18620350993 is 39905302681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17727058449 + 893292544 = 133143^2 + 29888^2 .

It is a cyclic number.

It is not a de Polignac number, because 18620350993 - 2¹³ = 18620342801 is a prime.

It is a super-2 number, since 2×18620350993² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18620350933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310175496 + 9310175497.

It is an arithmetic number, because the mean of its divisors is an integer number (9310175497).

Almost surely, 2^18620350993 is an apocalyptic number.

It is an amenable number.

18620350993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18620350993 is an equidigital number, since it uses as much as digits as its factorization.

18620350993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 18620350993 in words is "eighteen billion, six hundred twenty million, three hundred fifty thousand, nine hundred ninety-three".