243167128807681 has 16 divisors (see below), whose sum is σ = 277651750320000. Its totient is φ = 210972449380608.

The previous prime is 243167128807517. The next prime is 243167128807703. The reversal of 243167128807681 is 186708821761342.

It is a cyclic number.

It is not a de Polignac number, because 243167128807681 - 2⁴¹ = 240968105552129 is a prime.

It is a super-2 number, since 2×243167128807681² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243167128807381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 744291181 + ... + 744617818.

It is an arithmetic number, because the mean of its divisors is an integer number (17353234395000).

Almost surely, 2^{243167128807681} is an apocalyptic number.

It is an amenable number.

243167128807681 is a deficient number, since it is larger than the sum of its proper divisors (34484621512319).

243167128807681 is a wasteful number, since it uses less digits than its factorization.

243167128807681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488909768.

The product of its (nonzero) digits is 43352064, while the sum is 64.

The spelling of 243167128807681 in words is "two hundred forty-three trillion, one hundred sixty-seven billion, one hundred twenty-eight million, eight hundred seven thousand, six hundred eighty-one".