646488400841 has 8 divisors (see below), whose sum is σ = 654706174080. Its totient is φ = 638271487152.

The previous prime is 646488400829. The next prime is 646488400849. The reversal of 646488400841 is 148004884646.

It is a happy number.

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 646488400841 - 2³⁰ = 645414659017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646488400849) 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 7 ways as a sum of consecutive naturals, for example, 1373006 + ... + 1782728.

It is an arithmetic number, because the mean of its divisors is an integer number (81838271760).

Almost surely, 2^646488400841 is an apocalyptic number.

It is an amenable number.

646488400841 is a deficient number, since it is larger than the sum of its proper divisors (8217773239).

646488400841 is a wasteful number, since it uses less digits than its factorization.

646488400841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429775.

The product of its (nonzero) digits is 4718592, while the sum is 53.

The spelling of 646488400841 in words is "six hundred forty-six billion, four hundred eighty-eight million, four hundred thousand, eight hundred forty-one".