20016611166571 has 4 divisors (see below), whose sum is σ = 20017063124512. Its totient is φ = 20016159208632.

The previous prime is 20016611166551. The next prime is 20016611166581. The reversal of 20016611166571 is 17566111661002.

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 20016611166571 - 2²¹ = 20016609069419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20016611166551) 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, 225912531 + ... + 226001116.

It is an arithmetic number, because the mean of its divisors is an integer number (5004265781128).

Almost surely, 2^{20016611166571} is an apocalyptic number.

20016611166571 is a deficient number, since it is larger than the sum of its proper divisors (451957941).

20016611166571 is an equidigital number, since it uses as much as digits as its factorization.

20016611166571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451957940.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 20016611166571 in words is "twenty trillion, sixteen billion, six hundred eleven million, one hundred sixty-six thousand, five hundred seventy-one".