68133915857 has 4 divisors (see below), whose sum is σ = 77867332416. Its totient is φ = 58400499300.

The previous prime is 68133915821. The next prime is 68133915881. The reversal of 68133915857 is 75851933186.

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 a cyclic number.

It is not a de Polignac number, because 68133915857 - 2⁸ = 68133915601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68133915457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4866708269 + ... + 4866708282.

It is an arithmetic number, because the mean of its divisors is an integer number (19466833104).

Almost surely, 2^68133915857 is an apocalyptic number.

It is an amenable number.

68133915857 is a deficient number, since it is larger than the sum of its proper divisors (9733416559).

68133915857 is an equidigital number, since it uses as much as digits as its factorization.

68133915857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9733416558.

The product of its digits is 5443200, while the sum is 56.

The spelling of 68133915857 in words is "sixty-eight billion, one hundred thirty-three million, nine hundred fifteen thousand, eight hundred fifty-seven".