671166015243521 has 16 divisors (see below), whose sum is σ = 780153815952000. Its totient is φ = 565457603555328.

The previous prime is 671166015243499. The next prime is 671166015243541. The reversal of 671166015243521 is 125342510661176.

It is a cyclic number.

It is not a de Polignac number, because 671166015243521 - 2¹⁴ = 671166015227137 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 671166015243521.

It is not an unprimeable number, because it can be changed into a prime (671166015243541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107530880 + ... + 113601153.

It is an arithmetic number, because the mean of its divisors is an integer number (48759613497000).

Almost surely, 2^{671166015243521} is an apocalyptic number.

It is an amenable number.

671166015243521 is a deficient number, since it is larger than the sum of its proper divisors (108987800708479).

671166015243521 is a wasteful number, since it uses less digits than its factorization.

671166015243521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221139448.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 671166015243521 in words is "six hundred seventy-one trillion, one hundred sixty-six billion, fifteen million, two hundred forty-three thousand, five hundred twenty-one".