18213496277993 has 2 divisors, whose sum is σ = 18213496277994. Its totient is φ = 18213496277992.

The previous prime is 18213496277989. The next prime is 18213496278037. The reversal of 18213496277993 is 39977269431281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15276426969049 + 2937069308944 = 3908507^2 + 1713788^2 .

It is a cyclic number.

It is not a de Polignac number, because 18213496277993 - 2² = 18213496277989 is a prime.

It is a super-2 number, since 2×18213496277993² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18213496247993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106748138996 + 9106748138997.

It is an arithmetic number, because the mean of its divisors is an integer number (9106748138997).

Almost surely, 2^{18213496277993} is an apocalyptic number.

It is an amenable number.

18213496277993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213496277993 is an equidigital number, since it uses as much as digits as its factorization.

18213496277993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246903552, while the sum is 71.

The spelling of 18213496277993 in words is "eighteen trillion, two hundred thirteen billion, four hundred ninety-six million, two hundred seventy-seven thousand, nine hundred ninety-three".