643431505134345 has 32 divisors (see below), whose sum is σ = 1051516313694720. Its totient is φ = 335823193332480.

The previous prime is 643431505134269. The next prime is 643431505134361. The reversal of 643431505134345 is 543431505134346.

It is not a de Polignac number, because 643431505134345 - 2³⁶ = 643362785657609 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46800366 + ... + 58967255.

It is an arithmetic number, because the mean of its divisors is an integer number (32859884802960).

Almost surely, 2^{643431505134345} is an apocalyptic number.

It is an amenable number.

643431505134345 is a deficient number, since it is larger than the sum of its proper divisors (408084808560375).

643431505134345 is a wasteful number, since it uses less digits than its factorization.

643431505134345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105776305.

The product of its (nonzero) digits is 15552000, while the sum is 51.

Subtracting from 643431505134345 its reverse (543431505134346), we obtain a palindrome (99999999999999).

The spelling of 643431505134345 in words is "six hundred forty-three trillion, four hundred thirty-one billion, five hundred five million, one hundred thirty-four thousand, three hundred forty-five".