83387321993 has 2 divisors, whose sum is σ = 83387321994. Its totient is φ = 83387321992.

The previous prime is 83387321977. The next prime is 83387322061. The reversal of 83387321993 is 39912378338.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83245521529 + 141800464 = 288523^2 + 11908^2 .

It is a cyclic number.

It is not a de Polignac number, because 83387321993 - 2⁴ = 83387321977 is a prime.

It is a super-2 number, since 2×83387321993² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (83387321903) 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, 41693660996 + 41693660997.

It is an arithmetic number, because the mean of its divisors is an integer number (41693660997).

Almost surely, 2^83387321993 is an apocalyptic number.

It is an amenable number.

83387321993 is a deficient number, since it is larger than the sum of its proper divisors (1).

83387321993 is an equidigital number, since it uses as much as digits as its factorization.

83387321993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The spelling of 83387321993 in words is "eighty-three billion, three hundred eighty-seven million, three hundred twenty-one thousand, nine hundred ninety-three".