16516111101666 has 64 divisors (see below), whose sum is σ = 36054126452736. Its totient is φ = 5002247580800.

The previous prime is 16516111101661. The next prime is 16516111101751. The reversal of 16516111101666 is 66610111161561.

It is not an unprimeable number, because it can be changed into a prime (16516111101661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1465097806 + ... + 1465109078.

It is an arithmetic number, because the mean of its divisors is an integer number (563345725824).

Almost surely, 2^{16516111101666} is an apocalyptic number.

16516111101666 is an abundant number, since it is smaller than the sum of its proper divisors (19538015351070).

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

16516111101666 is a wasteful number, since it uses less digits than its factorization.

16516111101666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21007.

The product of its (nonzero) digits is 38880, while the sum is 42.

The spelling of 16516111101666 in words is "sixteen trillion, five hundred sixteen billion, one hundred eleven million, one hundred one thousand, six hundred sixty-six".