16667146061521 has 4 divisors (see below), whose sum is σ = 16667190852532. Its totient is φ = 16667101270512.

The previous prime is 16667146061471. The next prime is 16667146061563. The reversal of 16667146061521 is 12516064176661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9974473581121 + 6692672480400 = 3158239^2 + 2587020^2 .

It is a cyclic number.

It is not a de Polignac number, because 16667146061521 - 2⁹ = 16667146061009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16667146062521) 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, 21832626 + ... + 22583131.

It is an arithmetic number, because the mean of its divisors is an integer number (4166797713133).

Almost surely, 2^{16667146061521} is an apocalyptic number.

It is an amenable number.

16667146061521 is a deficient number, since it is larger than the sum of its proper divisors (44791011).

16667146061521 is an equidigital number, since it uses as much as digits as its factorization.

16667146061521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44791010.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 16667146061521 in words is "sixteen trillion, six hundred sixty-seven billion, one hundred forty-six million, sixty-one thousand, five hundred twenty-one".