16667221566 has 32 divisors (see below), whose sum is σ = 35328540960. Its totient is φ = 5224006656.

The previous prime is 16667221547. The next prime is 16667221603. The reversal of 16667221566 is 66512276661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32610 + ... + 185466.

It is an arithmetic number, because the mean of its divisors is an integer number (1104016905).

Almost surely, 2^16667221566 is an apocalyptic number.

16667221566 is an abundant number, since it is smaller than the sum of its proper divisors (18661319394).

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

16667221566 is a wasteful number, since it uses less digits than its factorization.

16667221566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153948.

The product of its digits is 1088640, while the sum is 48.

The spelling of 16667221566 in words is "sixteen billion, six hundred sixty-seven million, two hundred twenty-one thousand, five hundred sixty-six".