645412543 has 4 divisors (see below), whose sum is σ = 645465168. Its totient is φ = 645359920.

The previous prime is 645412519. The next prime is 645412549. The reversal of 645412543 is 345214546.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 645412543 - 2⁵ = 645412511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645412499 and 645412508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645412549) 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, 2883 + ... + 36043.

It is an arithmetic number, because the mean of its divisors is an integer number (161366292).

Almost surely, 2^645412543 is an apocalyptic number.

645412543 is a deficient number, since it is larger than the sum of its proper divisors (52625).

645412543 is a wasteful number, since it uses less digits than its factorization.

645412543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52624.

The product of its digits is 57600, while the sum is 34.

The square root of 645412543 is about 25404.9708324965. The cubic root of 645412543 is about 864.1964283722.

The spelling of 645412543 in words is "six hundred forty-five million, four hundred twelve thousand, five hundred forty-three".