646414191909 has 16 divisors (see below), whose sum is σ = 960770050240. Its totient is φ = 429539066640.

The previous prime is 646414191901. The next prime is 646414191919. The reversal of 646414191909 is 909191414646.

646414191909 is a `hidden beast` number, since 6 + 464 + 1 + 4 + 1 + 91 + 90 + 9 = 666.

It is not a de Polignac number, because 646414191909 - 2³ = 646414191901 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 (646414191901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38984002 + ... + 39000579.

It is an arithmetic number, because the mean of its divisors is an integer number (60048128140).

Almost surely, 2^646414191909 is an apocalyptic number.

It is an amenable number.

646414191909 is a deficient number, since it is larger than the sum of its proper divisors (314355858331).

646414191909 is a wasteful number, since it uses less digits than its factorization.

646414191909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77984897 (or 77984891 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 646414191909 in words is "six hundred forty-six billion, four hundred fourteen million, one hundred ninety-one thousand, nine hundred nine".