645653343 has 8 divisors (see below), whose sum is σ = 875462400. Its totient is φ = 423139928.

The previous prime is 645653321. The next prime is 645653369. The reversal of 645653343 is 343356546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645653343 - 2¹² = 645649247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645653143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1823703 + ... + 1824056.

It is an arithmetic number, because the mean of its divisors is an integer number (109432800).

Almost surely, 2^645653343 is an apocalyptic number.

645653343 is a deficient number, since it is larger than the sum of its proper divisors (229809057).

645653343 is a wasteful number, since it uses less digits than its factorization.

645653343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3647821.

The product of its digits is 388800, while the sum is 39.

The square root of 645653343 is about 25409.7096205368. The cubic root of 645653343 is about 864.3038907116.

The spelling of 645653343 in words is "six hundred forty-five million, six hundred fifty-three thousand, three hundred forty-three".