20165617199999 has 8 divisors (see below), whose sum is σ = 20173851977760. Its totient is φ = 20157382780416.

The previous prime is 20165617199957. The next prime is 20165617200013. The reversal of 20165617199999 is 99999171656102.

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 20165617199999 - 2¹⁶ = 20165617134463 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 (20165617499999) 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, 220273667 + ... + 220365195.

It is an arithmetic number, because the mean of its divisors is an integer number (2521731497220).

Almost surely, 2^{20165617199999} is an apocalyptic number.

20165617199999 is a deficient number, since it is larger than the sum of its proper divisors (8234777761).

20165617199999 is an equidigital number, since it uses as much as digits as its factorization.

20165617199999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179089.

The product of its (nonzero) digits is 148803480, while the sum is 74.

The spelling of 20165617199999 in words is "twenty trillion, one hundred sixty-five billion, six hundred seventeen million, one hundred ninety-nine thousand, nine hundred ninety-nine".