66193340517 has 12 divisors (see below), whose sum is σ = 95739926464. Its totient is φ = 44070129000.

The previous prime is 66193340503. The next prime is 66193340539. The reversal of 66193340517 is 71504339166.

It is a happy number.

66193340517 is a `hidden beast` number, since 6 + 6 + 1 + 93 + 3 + 40 + 517 = 666.

It is not a de Polignac number, because 66193340517 - 2⁸ = 66193340261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66193340597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4889923 + ... + 4903440.

Almost surely, 2^66193340517 is an apocalyptic number.

It is an amenable number.

66193340517 is a deficient number, since it is larger than the sum of its proper divisors (29546585947).

66193340517 is a wasteful number, since it uses less digits than its factorization.

66193340517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9794120 (or 9794117 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 66193340517 in words is "sixty-six billion, one hundred ninety-three million, three hundred forty thousand, five hundred seventeen".