16661774641027 has 4 divisors (see below), whose sum is σ = 16664531849560. Its totient is φ = 16659017432496.

The previous prime is 16661774640997. The next prime is 16661774641073. The reversal of 16661774641027 is 72014647716661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16661774641027 - 2¹¹ = 16661774638979 is a prime.

It is a super-2 number, since 2×16661774641027² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661774641087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378595202 + ... + 1378607287.

It is an arithmetic number, because the mean of its divisors is an integer number (4166132962390).

Almost surely, 2^{16661774641027} is an apocalyptic number.

16661774641027 is a deficient number, since it is larger than the sum of its proper divisors (2757208533).

16661774641027 is an equidigital number, since it uses as much as digits as its factorization.

16661774641027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757208532.

The product of its (nonzero) digits is 14224896, while the sum is 58.

The spelling of 16661774641027 in words is "sixteen trillion, six hundred sixty-one billion, seven hundred seventy-four million, six hundred forty-one thousand, twenty-seven".