6001666156561 has 8 divisors (see below), whose sum is σ = 6262633117440. Its totient is φ = 5740701275232.

The previous prime is 6001666156517. The next prime is 6001666156589. The reversal of 6001666156561 is 1656516661006.

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

It is a cyclic number.

It is not a de Polignac number, because 6001666156561 - 2⁷ = 6001666156433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6001666156061) 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 7 ways as a sum of consecutive naturals, for example, 9427416 + ... + 10043878.

It is an arithmetic number, because the mean of its divisors is an integer number (782829139680).

Almost surely, 2^{6001666156561} is an apocalyptic number.

It is an amenable number.

6001666156561 is a deficient number, since it is larger than the sum of its proper divisors (260966960879).

6001666156561 is a wasteful number, since it uses less digits than its factorization.

6001666156561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039775.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 6001666156561 in words is "six trillion, one billion, six hundred sixty-six million, one hundred fifty-six thousand, five hundred sixty-one".