643116264411121 has 4 divisors (see below), whose sum is σ = 671077841124672. Its totient is φ = 615154687697572.

The previous prime is 643116264411109. The next prime is 643116264411211. The reversal of 643116264411121 is 121114462611346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643116264411121 - 2³⁷ = 642978825457649 is a prime.

It is a super-2 number, since 2×643116264411121² (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 (643116264411521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13980788356741 + ... + 13980788356786.

It is an arithmetic number, because the mean of its divisors is an integer number (167769460281168).

Almost surely, 2^{643116264411121} is an apocalyptic number.

It is an amenable number.

643116264411121 is a deficient number, since it is larger than the sum of its proper divisors (27961576713551).

643116264411121 is a wasteful number, since it uses less digits than its factorization.

643116264411121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27961576713550.

The product of its digits is 165888, while the sum is 43.

The spelling of 643116264411121 in words is "six hundred forty-three trillion, one hundred sixteen billion, two hundred sixty-four million, four hundred eleven thousand, one hundred twenty-one".