646457613 has 4 divisors (see below), whose sum is σ = 861943488. Its totient is φ = 430971740.

The previous prime is 646457579. The next prime is 646457633. The reversal of 646457613 is 316754646.

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 a cyclic number.

It is not a de Polignac number, because 646457613 - 2⁶ = 646457549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646457633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107742933 + ... + 107742938.

It is an arithmetic number, because the mean of its divisors is an integer number (215485872).

Almost surely, 2^646457613 is an apocalyptic number.

It is an amenable number.

646457613 is a deficient number, since it is larger than the sum of its proper divisors (215485875).

646457613 is a wasteful number, since it uses less digits than its factorization.

646457613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215485874.

The product of its digits is 362880, while the sum is 42.

The square root of 646457613 is about 25425.5307319238. The cubic root of 646457613 is about 864.6626204964.

The spelling of 646457613 in words is "six hundred forty-six million, four hundred fifty-seven thousand, six hundred thirteen".