643264321159 has 4 divisors (see below), whose sum is σ = 645586575304. Its totient is φ = 640942067016.

The previous prime is 643264321129. The next prime is 643264321171. The reversal of 643264321159 is 951123462346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 951123462346 = 2 ⋅475561731173.

It is a cyclic number.

It is not a de Polignac number, because 643264321159 - 2⁷ = 643264321031 is a prime.

It is a super-2 number, since 2×643264321159² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643264321109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1161126657 + ... + 1161127210.

It is an arithmetic number, because the mean of its divisors is an integer number (161396643826).

Almost surely, 2^643264321159 is an apocalyptic number.

643264321159 is a deficient number, since it is larger than the sum of its proper divisors (2322254145).

643264321159 is a wasteful number, since it uses less digits than its factorization.

643264321159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322254144.

The product of its digits is 933120, while the sum is 46.

The spelling of 643264321159 in words is "six hundred forty-three billion, two hundred sixty-four million, three hundred twenty-one thousand, one hundred fifty-nine".