643457754345 has 48 divisors (see below), whose sum is σ = 1198123073280. Its totient is φ = 294028390656.

The previous prime is 643457754341. The next prime is 643457754371. The reversal of 643457754345 is 543457754346.

It is a happy number.

It is not a de Polignac number, because 643457754345 - 2² = 643457754341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643457754341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1575936 + ... + 1941774.

It is an arithmetic number, because the mean of its divisors is an integer number (24960897360).

Almost surely, 2^643457754345 is an apocalyptic number.

It is an amenable number.

643457754345 is a deficient number, since it is larger than the sum of its proper divisors (554665318935).

643457754345 is a wasteful number, since it uses less digits than its factorization.

643457754345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368254 (or 368247 counting only the distinct ones).

The product of its digits is 84672000, while the sum is 57.

Subtracting from 643457754345 its reverse (543457754346), we obtain a palindrome (99999999999).

The spelling of 643457754345 in words is "six hundred forty-three billion, four hundred fifty-seven million, seven hundred fifty-four thousand, three hundred forty-five".