643058505381 has 4 divisors (see below), whose sum is σ = 857411340512. Its totient is φ = 428705670252.

The previous prime is 643058505301. The next prime is 643058505491. The reversal of 643058505381 is 183505850346.

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 not a de Polignac number, because 643058505381 - 2¹⁸ = 643058243237 is a prime.

It is a super-2 number, since 2×643058505381² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643058505381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643058505301) 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, 107176417561 + ... + 107176417566.

It is an arithmetic number, because the mean of its divisors is an integer number (214352835128).

Almost surely, 2^643058505381 is an apocalyptic number.

It is an amenable number.

643058505381 is a deficient number, since it is larger than the sum of its proper divisors (214352835131).

643058505381 is a wasteful number, since it uses less digits than its factorization.

643058505381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214352835130.

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 643058505381 in words is "six hundred forty-three billion, fifty-eight million, five hundred five thousand, three hundred eighty-one".