16661121111674 has 8 divisors (see below), whose sum is σ = 26914118718900. Its totient is φ = 7689748205376.

The previous prime is 16661121111671. The next prime is 16661121111683. The reversal of 16661121111674 is 47611112116661.

It can be written as a sum of positive squares in 2 ways, for example, as 13955566561225 + 2705554550449 = 3735715^2 + 1644857^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (16661121111671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320406175199 + ... + 320406175250.

Almost surely, 2^{16661121111674} is an apocalyptic number.

16661121111674 is a deficient number, since it is larger than the sum of its proper divisors (10252997607226).

16661121111674 is a wasteful number, since it uses less digits than its factorization.

16661121111674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640812350464.

The product of its digits is 72576, while the sum is 44.

The spelling of 16661121111674 in words is "sixteen trillion, six hundred sixty-one billion, one hundred twenty-one million, one hundred eleven thousand, six hundred seventy-four".