68131881332 has 6 divisors (see below), whose sum is σ = 119230792338. Its totient is φ = 34065940664.

The previous prime is 68131881281. The next prime is 68131881343. The reversal of 68131881332 is 23318813186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 46274032996 + 21857848336 = 215114^2 + 147844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8516485163 + ... + 8516485170.

It is an arithmetic number, because the mean of its divisors is an integer number (19871798723).

Almost surely, 2^68131881332 is an apocalyptic number.

It is an amenable number.

68131881332 is a deficient number, since it is larger than the sum of its proper divisors (51098911006).

68131881332 is a wasteful number, since it uses less digits than its factorization.

68131881332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17032970337 (or 17032970335 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The spelling of 68131881332 in words is "sixty-eight billion, one hundred thirty-one million, eight hundred eighty-one thousand, three hundred thirty-two".