645464203 has 4 divisors (see below), whose sum is σ = 673527888. Its totient is φ = 617400520.

The previous prime is 645464201. The next prime is 645464213. The reversal of 645464203 is 302464546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645464203 - 2¹ = 645464201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645464201) 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, 14031808 + ... + 14031853.

It is an arithmetic number, because the mean of its divisors is an integer number (168381972).

Almost surely, 2^645464203 is an apocalyptic number.

645464203 is a deficient number, since it is larger than the sum of its proper divisors (28063685).

645464203 is a wasteful number, since it uses less digits than its factorization.

645464203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28063684.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 645464203 is about 25405.9875423098. The cubic root of 645464203 is about 864.2194850445.

The spelling of 645464203 in words is "six hundred forty-five million, four hundred sixty-four thousand, two hundred three".