68039021091 has 8 divisors (see below), whose sum is σ = 90724797520. Its totient is φ = 45356296032.

The previous prime is 68039021053. The next prime is 68039021117. The reversal of 68039021091 is 19012093086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68039021091 - 2⁷ = 68039020963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68039021051) 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 7 ways as a sum of consecutive naturals, for example, 710296 + ... + 800373.

It is an arithmetic number, because the mean of its divisors is an integer number (11340599690).

Almost surely, 2^68039021091 is an apocalyptic number.

68039021091 is a deficient number, since it is larger than the sum of its proper divisors (22685776429).

68039021091 is a wasteful number, since it uses less digits than its factorization.

68039021091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525685.

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 68039021091 in words is "sixty-eight billion, thirty-nine million, twenty-one thousand, ninety-one".