16618116541566 has 32 divisors (see below), whose sum is σ = 34985775058560. Its totient is φ = 5247786293856.

The previous prime is 16618116541561. The next prime is 16618116541627. The reversal of 16618116541566 is 66514561181661.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16618116541561) 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, 16857505 + ... + 17816051.

It is an arithmetic number, because the mean of its divisors is an integer number (1093305470580).

Almost surely, 2^{16618116541566} is an apocalyptic number.

16618116541566 is an abundant number, since it is smaller than the sum of its proper divisors (18367658516994).

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

16618116541566 is a wasteful number, since it uses less digits than its factorization.

16618116541566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110648.

The product of its digits is 6220800, while the sum is 57.

The spelling of 16618116541566 in words is "sixteen trillion, six hundred eighteen billion, one hundred sixteen million, five hundred forty-one thousand, five hundred sixty-six".