643082280345 has 16 divisors (see below), whose sum is σ = 1143257387520. Its totient is φ = 342977216112.

The previous prime is 643082280341. The next prime is 643082280349. The reversal of 643082280345 is 543082280346.

643082280345 is a `hidden beast` number, since 64 + 308 + 2 + 280 + 3 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (643082280341) and next prime (643082280349).

It is not a de Polignac number, because 643082280345 - 2² = 643082280341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 643082280345.

It is not an unprimeable number, because it can be changed into a prime (643082280341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2381786089 + ... + 2381786358.

It is an arithmetic number, because the mean of its divisors is an integer number (71453586720).

Almost surely, 2^643082280345 is an apocalyptic number.

It is an amenable number.

643082280345 is a deficient number, since it is larger than the sum of its proper divisors (500175107175).

643082280345 is a wasteful number, since it uses less digits than its factorization.

643082280345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763572461 (or 4763572455 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 45.

Subtracting from 643082280345 its reverse (543082280346), we obtain a palindrome (99999999999).

The spelling of 643082280345 in words is "six hundred forty-three billion, eighty-two million, two hundred eighty thousand, three hundred forty-five".