16818029993 has 2 divisors, whose sum is σ = 16818029994. Its totient is φ = 16818029992.

The previous prime is 16818029971. The next prime is 16818030107. The reversal of 16818029993 is 39992081861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16172717584 + 645312409 = 127172^2 + 25403^2 .

It is a cyclic number.

It is not a de Polignac number, because 16818029993 - 2¹⁸ = 16817767849 is a prime.

It is a super-2 number, since 2×16818029993² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16818029923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8409014996 + 8409014997.

It is an arithmetic number, because the mean of its divisors is an integer number (8409014997).

Almost surely, 2^16818029993 is an apocalyptic number.

It is an amenable number.

16818029993 is a deficient number, since it is larger than the sum of its proper divisors (1).

16818029993 is an equidigital number, since it uses as much as digits as its factorization.

16818029993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The spelling of 16818029993 in words is "sixteen billion, eight hundred eighteen million, twenty-nine thousand, nine hundred ninety-three".