643045460203123 has 4 divisors (see below), whose sum is σ = 671003958472848. Its totient is φ = 615086961933400.

The previous prime is 643045460203109. The next prime is 643045460203163. The reversal of 643045460203123 is 321302064540346.

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 643045460203123 - 2¹³ = 643045460194931 is a prime.

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 643045460203123.

It is not an unprimeable number, because it can be changed into a prime (643045460203163) 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, 13979249134828 + ... + 13979249134873.

It is an arithmetic number, because the mean of its divisors is an integer number (167750989618212).

Almost surely, 2^{643045460203123} is an apocalyptic number.

643045460203123 is a deficient number, since it is larger than the sum of its proper divisors (27958498269725).

643045460203123 is a wasteful number, since it uses less digits than its factorization.

643045460203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27958498269724.

The product of its (nonzero) digits is 1244160, while the sum is 43.

The spelling of 643045460203123 in words is "six hundred forty-three trillion, forty-five billion, four hundred sixty million, two hundred three thousand, one hundred twenty-three".