643165216663166 has 16 divisors (see below), whose sum is σ = 964967162796000. Its totient is φ = 321509496803808.

The previous prime is 643165216663159. The next prime is 643165216663213. The reversal of 643165216663166 is 661366612561346.

It is a super-2 number, since 2×643165216663166² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643165216663099 and 643165216663108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2405004476 + ... + 2405271888.

It is an arithmetic number, because the mean of its divisors is an integer number (60310447674750).

Almost surely, 2^{643165216663166} is an apocalyptic number.

643165216663166 is a deficient number, since it is larger than the sum of its proper divisors (321801946132834).

643165216663166 is a wasteful number, since it uses less digits than its factorization.

643165216663166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536323.

The product of its digits is 100776960, while the sum is 62.

The spelling of 643165216663166 in words is "six hundred forty-three trillion, one hundred sixty-five billion, two hundred sixteen million, six hundred sixty-three thousand, one hundred sixty-six".