68031467857 has 4 divisors (see below), whose sum is σ = 68032094260. Its totient is φ = 68030841456.

The previous prime is 68031467843. The next prime is 68031467869. The reversal of 68031467857 is 75876413086.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11389371841 + 56642096016 = 106721^2 + 237996^2 .

It is a cyclic number.

It is not a de Polignac number, because 68031467857 - 2¹¹ = 68031465809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68031467798 and 68031467807.

It is not an unprimeable number, because it can be changed into a prime (68031467557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103482 + ... + 383107.

It is an arithmetic number, because the mean of its divisors is an integer number (17008023565).

Almost surely, 2^68031467857 is an apocalyptic number.

It is an amenable number.

68031467857 is a deficient number, since it is larger than the sum of its proper divisors (626403).

68031467857 is a wasteful number, since it uses less digits than its factorization.

68031467857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626402.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 68031467857 in words is "sixty-eight billion, thirty-one million, four hundred sixty-seven thousand, eight hundred fifty-seven".