646366916791 has 8 divisors (see below), whose sum is σ = 663562073664. Its totient is φ = 629239860480.

The previous prime is 646366916737. The next prime is 646366916801. The reversal of 646366916791 is 197619663646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646366916791 - 2²⁵ = 646333362359 is a prime.

It is a super-2 number, since 2×646366916791² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646366916711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17005906 + ... + 17043871.

It is an arithmetic number, because the mean of its divisors is an integer number (82945259208).

Almost surely, 2^646366916791 is an apocalyptic number.

646366916791 is a deficient number, since it is larger than the sum of its proper divisors (17195156873).

646366916791 is a wasteful number, since it uses less digits than its factorization.

646366916791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34050281.

The product of its digits is 52907904, while the sum is 64.

The spelling of 646366916791 in words is "six hundred forty-six billion, three hundred sixty-six million, nine hundred sixteen thousand, seven hundred ninety-one".