66722516917 has 8 divisors (see below), whose sum is σ = 76405908096. Its totient is φ = 57077026512.

The previous prime is 66722516911. The next prime is 66722516921. The reversal of 66722516917 is 71961522766.

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 66722516917 - 2³¹ = 64575033269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66722516911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9471418 + ... + 9478459.

It is an arithmetic number, because the mean of its divisors is an integer number (9550738512).

Almost surely, 2^66722516917 is an apocalyptic number.

It is an amenable number.

66722516917 is a deficient number, since it is larger than the sum of its proper divisors (9683391179).

66722516917 is a wasteful number, since it uses less digits than its factorization.

66722516917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18950387.

The product of its digits is 1905120, while the sum is 52.

The spelling of 66722516917 in words is "sixty-six billion, seven hundred twenty-two million, five hundred sixteen thousand, nine hundred seventeen".