646496659 has 4 divisors (see below), whose sum is σ = 651431880. Its totient is φ = 641561440.

The previous prime is 646496647. The next prime is 646496663. The reversal of 646496659 is 956694646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646496659 - 2⁷ = 646496531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646496359) 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, 2467414 + ... + 2467675.

It is an arithmetic number, because the mean of its divisors is an integer number (162857970).

Almost surely, 2^646496659 is an apocalyptic number.

646496659 is a deficient number, since it is larger than the sum of its proper divisors (4935221).

646496659 is a wasteful number, since it uses less digits than its factorization.

646496659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4935220.

The product of its digits is 8398080, while the sum is 55.

The square root of 646496659 is about 25426.2985705745. The cubic root of 646496659 is about 864.6800286689.

The spelling of 646496659 in words is "six hundred forty-six million, four hundred ninety-six thousand, six hundred fifty-nine".