645764303 has 4 divisors (see below), whose sum is σ = 646180080. Its totient is φ = 645348528.

The previous prime is 645764281. The next prime is 645764311. The reversal of 645764303 is 303467546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 303467546 = 2 ⋅151733773.

It is a cyclic number.

It is not a de Polignac number, because 645764303 - 2⁸ = 645764047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645764323) 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, 205550 + ... + 208667.

It is an arithmetic number, because the mean of its divisors is an integer number (161545020).

Almost surely, 2^645764303 is an apocalyptic number.

645764303 is a deficient number, since it is larger than the sum of its proper divisors (415777).

645764303 is a wasteful number, since it uses less digits than its factorization.

645764303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415776.

The product of its (nonzero) digits is 181440, while the sum is 38.

The square root of 645764303 is about 25411.8929440528. The cubic root of 645764303 is about 864.3534000793.

The spelling of 645764303 in words is "six hundred forty-five million, seven hundred sixty-four thousand, three hundred three".