66916763409 has 8 divisors (see below), whose sum is σ = 89415893952. Its totient is φ = 44514404240.

The previous prime is 66916763377. The next prime is 66916763413. The reversal of 66916763409 is 90436761966.

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 66916763409 - 2⁵ = 66916763377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66916563409) 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 7 ways as a sum of consecutive naturals, for example, 24191229 + ... + 24193994.

It is an arithmetic number, because the mean of its divisors is an integer number (11176986744).

Almost surely, 2^66916763409 is an apocalyptic number.

It is an amenable number.

66916763409 is a deficient number, since it is larger than the sum of its proper divisors (22499130543).

66916763409 is a wasteful number, since it uses less digits than its factorization.

66916763409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48385687.

The product of its (nonzero) digits is 8817984, while the sum is 57.

The spelling of 66916763409 in words is "sixty-six billion, nine hundred sixteen million, seven hundred sixty-three thousand, four hundred nine".