99665980329217 has 8 divisors (see below), whose sum is σ = 99755252509320. Its totient is φ = 99576726681600.

The previous prime is 99665980329173. The next prime is 99665980329259. The reversal of 99665980329217 is 71292308956699.

It can be written as a sum of positive squares in 4 ways, for example, as 58972093890241 + 40693886438976 = 7679329^2 + 6379176^2 .

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-99665980329217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99665980329917) 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, 6138717 + ... + 15395317.

It is an arithmetic number, because the mean of its divisors is an integer number (12469406563665).

Almost surely, 2^{99665980329217} is an apocalyptic number.

It is an amenable number.

99665980329217 is a deficient number, since it is larger than the sum of its proper divisors (89272180103).

99665980329217 is a wasteful number, since it uses less digits than its factorization.

99665980329217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9266243.

The product of its (nonzero) digits is 793618560, while the sum is 76.

The spelling of 99665980329217 in words is "ninety-nine trillion, six hundred sixty-five billion, nine hundred eighty million, three hundred twenty-nine thousand, two hundred seventeen".