645464518 has 8 divisors (see below), whose sum is σ = 968864760. Its totient is φ = 322509600.

The previous prime is 645464497. The next prime is 645464527. The reversal of 645464518 is 815464546.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107683 + ... + 113518.

It is an arithmetic number, because the mean of its divisors is an integer number (121108095).

Almost surely, 2^645464518 is an apocalyptic number.

645464518 is a deficient number, since it is larger than the sum of its proper divisors (323400242).

645464518 is a wasteful number, since it uses less digits than its factorization.

645464518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222662.

The product of its digits is 460800, while the sum is 43.

The square root of 645464518 is about 25405.9937416351. The cubic root of 645464518 is about 864.2196256301.

The spelling of 645464518 in words is "six hundred forty-five million, four hundred sixty-four thousand, five hundred eighteen".