16661731223474 has 8 divisors (see below), whose sum is σ = 25019499525660. Its totient is φ = 8321898048256.

The previous prime is 16661731223413. The next prime is 16661731223587. The reversal of 16661731223474 is 47432213716661.

It can be written as a sum of positive squares in 2 ways, for example, as 16628917712449 + 32813511025 = 4077857^2 + 181145^2 .

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

It is a super-2 number, since 2×16661731223474² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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, 4483779419 + ... + 4483783134.

Almost surely, 2^{16661731223474} is an apocalyptic number.

16661731223474 is a deficient number, since it is larger than the sum of its proper divisors (8357768302186).

16661731223474 is an equidigital number, since it uses as much as digits as its factorization.

16661731223474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8967563484.

The product of its digits is 6096384, while the sum is 53.

The spelling of 16661731223474 in words is "sixteen trillion, six hundred sixty-one billion, seven hundred thirty-one million, two hundred twenty-three thousand, four hundred seventy-four".