645434559 has 24 divisors (see below), whose sum is σ = 1162342272. Its totient is φ = 335290320.

The previous prime is 645434521. The next prime is 645434567. The reversal of 645434559 is 955434546.

645434559 is a `hidden beast` number, since 64 + 5 + 4 + 34 + 559 = 666.

It is not a de Polignac number, because 645434559 - 2¹³ = 645426367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645434599) 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 23 ways as a sum of consecutive naturals, for example, 464989 + ... + 466374.

It is an arithmetic number, because the mean of its divisors is an integer number (48430928).

Almost surely, 2^645434559 is an apocalyptic number.

645434559 is a deficient number, since it is larger than the sum of its proper divisors (516907713).

645434559 is a wasteful number, since it uses less digits than its factorization.

645434559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931387 (or 931384 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The square root of 645434559 is about 25405.4041298303. The cubic root of 645434559 is about 864.2062546104.

The spelling of 645434559 in words is "six hundred forty-five million, four hundred thirty-four thousand, five hundred fifty-nine".