646288653 has 4 divisors (see below), whose sum is σ = 861718208. Its totient is φ = 430859100.

The previous prime is 646288627. The next prime is 646288679. The reversal of 646288653 is 356882646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (646288627) and next prime (646288679).

It is not a de Polignac number, because 646288653 - 2¹⁴ = 646272269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646289653) by changing a digit.

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, 107714773 + ... + 107714778.

It is an arithmetic number, because the mean of its divisors is an integer number (215429552).

Almost surely, 2^646288653 is an apocalyptic number.

It is an amenable number.

646288653 is a deficient number, since it is larger than the sum of its proper divisors (215429555).

646288653 is a wasteful number, since it uses less digits than its factorization.

646288653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215429554.

The product of its digits is 1658880, while the sum is 48.

The square root of 646288653 is about 25422.2078702854. The cubic root of 646288653 is about 864.5872837055.

The spelling of 646288653 in words is "six hundred forty-six million, two hundred eighty-eight thousand, six hundred fifty-three".