668514372833 has 4 divisors (see below), whose sum is σ = 668516008368. Its totient is φ = 668512737300.

The previous prime is 668514372811. The next prime is 668514372853. The reversal of 668514372833 is 338273415866.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 338273415866 = 2 ⋅169136707933.

It is a cyclic number.

It is not a de Polignac number, because 668514372833 - 2⁶ = 668514372769 is a prime.

It is a super-2 number, since 2×668514372833² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668514372803) 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, 386210 + ... + 1219092.

It is an arithmetic number, because the mean of its divisors is an integer number (167129002092).

Almost surely, 2^668514372833 is an apocalyptic number.

It is an amenable number.

668514372833 is a deficient number, since it is larger than the sum of its proper divisors (1635535).

668514372833 is an equidigital number, since it uses as much as digits as its factorization.

668514372833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635534.

The product of its digits is 17418240, while the sum is 56.

The spelling of 668514372833 in words is "six hundred sixty-eight billion, five hundred fourteen million, three hundred seventy-two thousand, eight hundred thirty-three".