20216256166 has 4 divisors (see below), whose sum is σ = 30324384252. Its totient is φ = 10108128082.

The previous prime is 20216256161. The next prime is 20216256167. The reversal of 20216256166 is 66165261202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66165261202 = 2 ⋅33082630601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216256161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5054064040 + ... + 5054064043.

It is an arithmetic number, because the mean of its divisors is an integer number (7581096063).

Almost surely, 2^20216256166 is an apocalyptic number.

20216256166 is a deficient number, since it is larger than the sum of its proper divisors (10108128086).

20216256166 is a wasteful number, since it uses less digits than its factorization.

20216256166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10108128085.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 20216256166 in words is "twenty billion, two hundred sixteen million, two hundred fifty-six thousand, one hundred sixty-six".