16615566561166 has 32 divisors (see below), whose sum is σ = 26710596687168. Its totient is φ = 7731591183360.

The previous prime is 16615566561149. The next prime is 16615566561169. The reversal of 16615566561166 is 66116566551661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16615566561169) 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, 74117406 + ... + 74341246.

It is an arithmetic number, because the mean of its divisors is an integer number (834706146474).

Almost surely, 2^{16615566561166} is an apocalyptic number.

16615566561166 is a deficient number, since it is larger than the sum of its proper divisors (10095030126002).

16615566561166 is a wasteful number, since it uses less digits than its factorization.

16615566561166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267516.

The product of its digits is 34992000, while the sum is 61.

The spelling of 16615566561166 in words is "sixteen trillion, six hundred fifteen billion, five hundred sixty-six million, five hundred sixty-one thousand, one hundred sixty-six".