66920516099 has 8 divisors (see below), whose sum is σ = 70861947408. Its totient is φ = 62979632640.

The previous prime is 66920516077. The next prime is 66920516107. The reversal of 66920516099 is 99061502966.

It is a Cunningham number, because it is equal to 258690²-1.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66920516099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66920516099.

It is not an unprimeable number, because it can be changed into a prime (66920516599) 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, 129344 + ... + 388034.

It is an arithmetic number, because the mean of its divisors is an integer number (8857743426).

Almost surely, 2^66920516099 is an apocalyptic number.

66920516099 is a deficient number, since it is larger than the sum of its proper divisors (3941431309).

66920516099 is a wasteful number, since it uses less digits than its factorization.

66920516099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273925.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 66920516099 in words is "sixty-six billion, nine hundred twenty million, five hundred sixteen thousand, ninety-nine".