645084559 has 16 divisors (see below), whose sum is σ = 755251200. Its totient is φ = 550750200.

The previous prime is 645084553. The next prime is 645084593. The reversal of 645084559 is 955480546.

It is not a de Polignac number, because 645084559 - 2¹⁹ = 644560271 is a prime.

It is a super-2 number, since 2×645084559² = 832268176520448962, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645084553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86634 + ... + 93784.

It is an arithmetic number, because the mean of its divisors is an integer number (47203200).

Almost surely, 2^645084559 is an apocalyptic number.

645084559 is a deficient number, since it is larger than the sum of its proper divisors (110166641).

645084559 is an equidigital number, since it uses as much as digits as its factorization.

645084559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7435 (or 7421 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 46.

The square root of 645084559 is about 25398.5148975289. The cubic root of 645084559 is about 864.0500152338.

The spelling of 645084559 in words is "six hundred forty-five million, eighty-four thousand, five hundred fifty-nine".