645450343 has 4 divisors (see below), whose sum is σ = 645501960. Its totient is φ = 645398728.

The previous prime is 645450341. The next prime is 645450347. The reversal of 645450343 is 343054546.

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 645450343 - 2¹ = 645450341 is a prime.

It is a super-2 number, since 2×645450343² = 833212290557635298, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645450299 and 645450308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645450341) 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, 6096 + ... + 36442.

It is an arithmetic number, because the mean of its divisors is an integer number (161375490).

Almost surely, 2^645450343 is an apocalyptic number.

645450343 is a deficient number, since it is larger than the sum of its proper divisors (51617).

645450343 is a wasteful number, since it uses less digits than its factorization.

645450343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51616.

The product of its (nonzero) digits is 86400, while the sum is 34.

The square root of 645450343 is about 25405.7147705000. The cubic root of 645450343 is about 864.2132992288.

It can be divided in two parts, 6454503 and 43, that added together give a palindrome (6454546).

The spelling of 645450343 in words is "six hundred forty-five million, four hundred fifty thousand, three hundred forty-three".