68508475393 has 4 divisors (see below), whose sum is σ = 68509185840. Its totient is φ = 68507764948.

The previous prime is 68508475381. The next prime is 68508475397. The reversal of 68508475393 is 39357480586.

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.

It is a cyclic number.

It is not a de Polignac number, because 68508475393 - 2²⁵ = 68474920961 is a prime.

It is a super-2 number, since 2×68508475393² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68508475397) 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, 182623 + ... + 412756.

It is an arithmetic number, because the mean of its divisors is an integer number (17127296460).

Almost surely, 2^68508475393 is an apocalyptic number.

It is an amenable number.

68508475393 is a deficient number, since it is larger than the sum of its proper divisors (710447).

68508475393 is a wasteful number, since it uses less digits than its factorization.

68508475393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710446.

The product of its (nonzero) digits is 21772800, while the sum is 58.

The spelling of 68508475393 in words is "sixty-eight billion, five hundred eight million, four hundred seventy-five thousand, three hundred ninety-three".