20116236564517 has 4 divisors (see below), whose sum is σ = 20116245777516. Its totient is φ = 20116227351520.

The previous prime is 20116236564497. The next prime is 20116236564521. The reversal of 20116236564517 is 71546563261102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7905398215716 + 12210838348801 = 2811654^2 + 3494401^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116236564517 - 2³⁵ = 20081876826149 is a prime.

It is a super-2 number, since 2×20116236564517² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20116236565517) 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, 727467 + ... + 6384487.

It is an arithmetic number, because the mean of its divisors is an integer number (5029061444379).

Almost surely, 2^{20116236564517} is an apocalyptic number.

It is an amenable number.

20116236564517 is a deficient number, since it is larger than the sum of its proper divisors (9212999).

20116236564517 is an equidigital number, since it uses as much as digits as its factorization.

20116236564517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9212998.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 20116236564517 in words is "twenty trillion, one hundred sixteen billion, two hundred thirty-six million, five hundred sixty-four thousand, five hundred seventeen".