16556662537566 has 16 divisors (see below), whose sum is σ = 33279723696000. Its totient is φ = 5491154409048.

The previous prime is 16556662537561. The next prime is 16556662537573. The reversal of 16556662537566 is 66573526665561.

It is a happy number.

It is a super-2 number, since 2×16556662537566² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16556662537566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556662537561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6933274576 + ... + 6933276963.

It is an arithmetic number, because the mean of its divisors is an integer number (2079982731000).

Almost surely, 2^{16556662537566} is an apocalyptic number.

16556662537566 is an abundant number, since it is smaller than the sum of its proper divisors (16723061158434).

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

16556662537566 is a wasteful number, since it uses less digits than its factorization.

16556662537566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13866551743.

The product of its digits is 1224720000, while the sum is 69.

The spelling of 16556662537566 in words is "sixteen trillion, five hundred fifty-six billion, six hundred sixty-two million, five hundred thirty-seven thousand, five hundred sixty-six".