16443580865945 has 16 divisors (see below), whose sum is σ = 20340939237840. Its totient is φ = 12751746626304.

The previous prime is 16443580865941. The next prime is 16443580865977. The reversal of 16443580865945 is 54956808534461.

It can be written as a sum of positive squares in 8 ways, for example, as 47365863769 + 16396215002176 = 217637^2 + 4049224^2 .

It is a cyclic number.

It is not a de Polignac number, because 16443580865945 - 2² = 16443580865941 is a prime.

It is a super-3 number, since 3×16443580865945³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16443580865941) 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, 165162542 + ... + 165262071.

It is an arithmetic number, because the mean of its divisors is an integer number (1271308702365).

Almost surely, 2^{16443580865945} is an apocalyptic number.

It is an amenable number.

16443580865945 is a deficient number, since it is larger than the sum of its proper divisors (3897358371895).

16443580865945 is a wasteful number, since it uses less digits than its factorization.

16443580865945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330424924.

The product of its (nonzero) digits is 497664000, while the sum is 68.

The spelling of 16443580865945 in words is "sixteen trillion, four hundred forty-three billion, five hundred eighty million, eight hundred sixty-five thousand, nine hundred forty-five".