68529721091 has 8 divisors (see below), whose sum is σ = 74063879904. Its totient is φ = 63033082560.

The previous prime is 68529721061. The next prime is 68529721097. The reversal of 68529721091 is 19012792586.

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

It is a cyclic number.

It is not a de Polignac number, because 68529721091 - 2¹⁴ = 68529704707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68529721097) 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, 9376271 + ... + 9383576.

It is an arithmetic number, because the mean of its divisors is an integer number (9257984988).

Almost surely, 2^68529721091 is an apocalyptic number.

68529721091 is a deficient number, since it is larger than the sum of its proper divisors (5534158813).

68529721091 is a wasteful number, since it uses less digits than its factorization.

68529721091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18760141.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 68529721091 in words is "sixty-eight billion, five hundred twenty-nine million, seven hundred twenty-one thousand, ninety-one".