103566991993 has 4 divisors (see below), whose sum is σ = 103752929700. Its totient is φ = 103381054288.

The previous prime is 103566991981. The next prime is 103566991999. The reversal of 103566991993 is 399199665301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7893078649 + 95673913344 = 88843^2 + 309312^2 .

It is a cyclic number.

It is not a de Polignac number, because 103566991993 - 2¹⁷ = 103566860921 is a prime.

It is a super-3 number, since 3×103566991993³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103566991999) 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 in 3 ways as a sum of consecutive naturals, for example, 92968018 + ... + 92969131.

It is an arithmetic number, because the mean of its divisors is an integer number (25938232425).

Almost surely, 2^103566991993 is an apocalyptic number.

It is an amenable number.

103566991993 is a deficient number, since it is larger than the sum of its proper divisors (185937707).

103566991993 is an equidigital number, since it uses as much as digits as its factorization.

103566991993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185937706.

The product of its (nonzero) digits is 10628820, while the sum is 61.

The spelling of 103566991993 in words is "one hundred three billion, five hundred sixty-six million, nine hundred ninety-one thousand, nine hundred ninety-three".