643114493509 has 4 divisors (see below), whose sum is σ = 645169172716. Its totient is φ = 641059814304.

The previous prime is 643114493467. The next prime is 643114493543. The reversal of 643114493509 is 905394411346.

It is a happy number.

643114493509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123835721409 + 519278772100 = 351903^2 + 720610^2 .

It is a cyclic number.

It is not a de Polignac number, because 643114493509 - 2¹⁹ = 643113969221 is a prime.

It is a super-2 number, since 2×643114493509² (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 (643114413509) 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, 1027339134 + ... + 1027339759.

It is an arithmetic number, because the mean of its divisors is an integer number (161292293179).

Almost surely, 2^643114493509 is an apocalyptic number.

It is an amenable number.

643114493509 is a deficient number, since it is larger than the sum of its proper divisors (2054679207).

643114493509 is a wasteful number, since it uses less digits than its factorization.

643114493509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054679206.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 643114493509 in words is "six hundred forty-three billion, one hundred fourteen million, four hundred ninety-three thousand, five hundred nine".