645403445 has 16 divisors (see below), whose sum is σ = 781438080. Its totient is φ = 511704000.

The previous prime is 645403417. The next prime is 645403463. The reversal of 645403445 is 544304546.

It is not a de Polignac number, because 645403445 - 2¹⁰ = 645402421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466655 + ... + 468035.

It is an arithmetic number, because the mean of its divisors is an integer number (48839880).

Almost surely, 2^645403445 is an apocalyptic number.

It is an amenable number.

645403445 is a deficient number, since it is larger than the sum of its proper divisors (136034635).

645403445 is a wasteful number, since it uses less digits than its factorization.

645403445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 115200, while the sum is 35.

The square root of 645403445 is about 25404.7917724196. The cubic root of 645403445 is about 864.1923676640.

The spelling of 645403445 in words is "six hundred forty-five million, four hundred three thousand, four hundred forty-five".