643136738823483 has 4 divisors (see below), whose sum is σ = 857515651764648. Its totient is φ = 428757825882320.

The previous prime is 643136738823431. The next prime is 643136738823497. The reversal of 643136738823483 is 384328837631346.

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

It is a cyclic number.

It is not a de Polignac number, because 643136738823483 - 2⁹ = 643136738822971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643136738823283) 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, 107189456470578 + ... + 107189456470583.

It is an arithmetic number, because the mean of its divisors is an integer number (214378912941162).

Almost surely, 2^{643136738823483} is an apocalyptic number.

643136738823483 is a deficient number, since it is larger than the sum of its proper divisors (214378912941165).

643136738823483 is a wasteful number, since it uses less digits than its factorization.

643136738823483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214378912941164.

The product of its digits is 1003290624, while the sum is 69.

The spelling of 643136738823483 in words is "six hundred forty-three trillion, one hundred thirty-six billion, seven hundred thirty-eight million, eight hundred twenty-three thousand, four hundred eighty-three".