68031644774831 has 32 divisors (see below), whose sum is σ = 74722490668800. Its totient is φ = 61651785072640.

The previous prime is 68031644774827. The next prime is 68031644774879. The reversal of 68031644774831 is 13847744613086.

It is a cyclic number.

It is not a de Polignac number, because 68031644774831 - 2² = 68031644774827 is a prime.

It is a super-2 number, since 2×68031644774831² (a number of 28 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 (68031644774231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1172303786 + ... + 1172361816.

It is an arithmetic number, because the mean of its divisors is an integer number (2335077833400).

Almost surely, 2^{68031644774831} is an apocalyptic number.

68031644774831 is a deficient number, since it is larger than the sum of its proper divisors (6690845893969).

68031644774831 is a wasteful number, since it uses less digits than its factorization.

68031644774831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64579.

The product of its (nonzero) digits is 65028096, while the sum is 62.

The spelling of 68031644774831 in words is "sixty-eight trillion, thirty-one billion, six hundred forty-four million, seven hundred seventy-four thousand, eight hundred thirty-one".