645333454 has 4 divisors (see below), whose sum is σ = 968000184. Its totient is φ = 322666726.

The previous prime is 645333389. The next prime is 645333497. The reversal of 645333454 is 454333546.

645333454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161333362 + ... + 161333365.

It is an arithmetic number, because the mean of its divisors is an integer number (242000046).

Almost surely, 2^645333454 is an apocalyptic number.

645333454 is a deficient number, since it is larger than the sum of its proper divisors (322666730).

645333454 is a wasteful number, since it uses less digits than its factorization.

645333454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322666729.

The product of its digits is 259200, while the sum is 37.

The square root of 645333454 is about 25403.4142193525. The cubic root of 645333454 is about 864.1611273212.

The spelling of 645333454 in words is "six hundred forty-five million, three hundred thirty-three thousand, four hundred fifty-four".