16385143566 has 32 divisors (see below), whose sum is σ = 36715609728. Its totient is φ = 4830999840.

The previous prime is 16385143561. The next prime is 16385143573. The reversal of 16385143566 is 66534158361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16385143561) 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, 3352420 + ... + 3357303.

It is an arithmetic number, because the mean of its divisors is an integer number (1147362804).

Almost surely, 2^16385143566 is an apocalyptic number.

16385143566 is an abundant number, since it is smaller than the sum of its proper divisors (20330466162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16385143566 is a wasteful number, since it uses less digits than its factorization.

16385143566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6709776.

The product of its digits is 1555200, while the sum is 48.

It can be divided in two parts, 16385 and 143566, that added together give a palindrome (159951).

The spelling of 16385143566 in words is "sixteen billion, three hundred eighty-five million, one hundred forty-three thousand, five hundred sixty-six".