208665093893 has 4 divisors (see below), whose sum is σ = 208686424320. Its totient is φ = 208643763468.

The previous prime is 208665093887. The next prime is 208665093899. The reversal of 208665093893 is 398390566802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (208665093887) and next prime (208665093899).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208665093893 is a prime.

It is a super-2 number, since 2×208665093893² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208665093899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10650533 + ... + 10670106.

It is an arithmetic number, because the mean of its divisors is an integer number (52171606080).

Almost surely, 2^208665093893 is an apocalyptic number.

It is an amenable number.

208665093893 is a deficient number, since it is larger than the sum of its proper divisors (21330427).

208665093893 is an equidigital number, since it uses as much as digits as its factorization.

208665093893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21330426.

The product of its (nonzero) digits is 16796160, while the sum is 59.

The spelling of 208665093893 in words is "two hundred eight billion, six hundred sixty-five million, ninety-three thousand, eight hundred ninety-three".