646574223513 has 4 divisors (see below), whose sum is σ = 862098964688. Its totient is φ = 431049482340.

The previous prime is 646574223511. The next prime is 646574223517. The reversal of 646574223513 is 315322475646.

It is a happy number.

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 not a de Polignac number, because 646574223513 - 2¹ = 646574223511 is a prime.

It is a super-2 number, since 2×646574223513² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646574223511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107762370583 + ... + 107762370588.

It is an arithmetic number, because the mean of its divisors is an integer number (215524741172).

Almost surely, 2^646574223513 is an apocalyptic number.

It is an amenable number.

646574223513 is a deficient number, since it is larger than the sum of its proper divisors (215524741175).

646574223513 is a wasteful number, since it uses less digits than its factorization.

646574223513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215524741174.

The product of its digits is 3628800, while the sum is 48.

The spelling of 646574223513 in words is "six hundred forty-six billion, five hundred seventy-four million, two hundred twenty-three thousand, five hundred thirteen".