20165398364159 has 4 divisors (see below), whose sum is σ = 20174950899840. Its totient is φ = 20155845828480.

The previous prime is 20165398364087. The next prime is 20165398364161. The reversal of 20165398364159 is 95146389356102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20165398364159 - 2³⁶ = 20096678887423 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 (20165398864159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4776264674 + ... + 4776268895.

It is an arithmetic number, because the mean of its divisors is an integer number (5043737724960).

Almost surely, 2^{20165398364159} is an apocalyptic number.

20165398364159 is a deficient number, since it is larger than the sum of its proper divisors (9552535681).

20165398364159 is an equidigital number, since it uses as much as digits as its factorization.

20165398364159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9552535680.

The product of its (nonzero) digits is 41990400, while the sum is 62.

The spelling of 20165398364159 in words is "twenty trillion, one hundred sixty-five billion, three hundred ninety-eight million, three hundred sixty-four thousand, one hundred fifty-nine".