646459559 has 4 divisors (see below), whose sum is σ = 646524480. Its totient is φ = 646394640.

The previous prime is 646459469. The next prime is 646459579. The reversal of 646459559 is 955954646.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 646459559 - 2²⁸ = 378024103 is a prime.

It is a super-2 number, since 2×646459559² = 835819922844948962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646459559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646459579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14039 + ... + 38600.

It is an arithmetic number, because the mean of its divisors is an integer number (161631120).

Almost surely, 2^646459559 is an apocalyptic number.

646459559 is a deficient number, since it is larger than the sum of its proper divisors (64921).

646459559 is a wasteful number, since it uses less digits than its factorization.

646459559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64920.

The product of its digits is 5832000, while the sum is 53.

The square root of 646459559 is about 25425.5690005160. The cubic root of 646459559 is about 864.6634881128.

The spelling of 646459559 in words is "six hundred forty-six million, four hundred fifty-nine thousand, five hundred fifty-nine".