643165216663099 has 16 divisors (see below), whose sum is σ = 696654262531584. Its totient is φ = 590259339331200.

The previous prime is 643165216663027. The next prime is 643165216663103. The reversal of 643165216663099 is 990366612561346.

It is a cyclic number.

It is not a de Polignac number, because 643165216663099 - 2¹³ = 643165216654907 is a prime.

It is a super-2 number, since 2×643165216663099² (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 (643165216664099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198935707 + ... + 202142884.

It is an arithmetic number, because the mean of its divisors is an integer number (43540891408224).

Almost surely, 2^{643165216663099} is an apocalyptic number.

643165216663099 is a deficient number, since it is larger than the sum of its proper divisors (53489045868485).

643165216663099 is a wasteful number, since it uses less digits than its factorization.

643165216663099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401079318.

The product of its (nonzero) digits is 226748160, while the sum is 67.

The spelling of 643165216663099 in words is "six hundred forty-three trillion, one hundred sixty-five billion, two hundred sixteen million, six hundred sixty-three thousand, ninety-nine".