20066716185665 has 16 divisors (see below), whose sum is σ = 25503103504080. Its totient is φ = 15105163560960.

The previous prime is 20066716185661. The next prime is 20066716185667. The reversal of 20066716185665 is 56658161766002.

It can be written as a sum of positive squares in 8 ways, for example, as 2814314918464 + 17252401267201 = 1677592^2 + 4153601^2 .

It is not a de Polignac number, because 20066716185665 - 2² = 20066716185661 is a prime.

It is a super-4 number, since 4×20066716185665⁴ (a number of 54 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (20066716185661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30084830 + ... + 30744599.

It is an arithmetic number, because the mean of its divisors is an integer number (1593943969005).

Almost surely, 2^{20066716185665} is an apocalyptic number.

It is an amenable number.

20066716185665 is a deficient number, since it is larger than the sum of its proper divisors (5436387318415).

20066716185665 is a wasteful number, since it uses less digits than its factorization.

20066716185665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60833332.

The product of its (nonzero) digits is 21772800, while the sum is 59.

The spelling of 20066716185665 in words is "twenty trillion, sixty-six billion, seven hundred sixteen million, one hundred eighty-five thousand, six hundred sixty-five".