67717923721 has 16 divisors (see below), whose sum is σ = 79224929280. Its totient is φ = 56682205200.

The previous prime is 67717923701. The next prime is 67717923761. The reversal of 67717923721 is 12732971776.

It is a cyclic number.

It is not a de Polignac number, because 67717923721 - 2¹¹ = 67717921673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67717923701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480571 + ... + 605296.

It is an arithmetic number, because the mean of its divisors is an integer number (4951558080).

Almost surely, 2^67717923721 is an apocalyptic number.

It is an amenable number.

67717923721 is a deficient number, since it is larger than the sum of its proper divisors (11507005559).

67717923721 is a wasteful number, since it uses less digits than its factorization.

67717923721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086084.

The product of its digits is 1555848, while the sum is 52.

The spelling of 67717923721 in words is "sixty-seven billion, seven hundred seventeen million, nine hundred twenty-three thousand, seven hundred twenty-one".