646105555063 has 8 divisors (see below), whose sum is σ = 664619504480. Its totient is φ = 627646955040.

The previous prime is 646105555019. The next prime is 646105555133. The reversal of 646105555063 is 360555501646.

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 646105555063 - 2²¹ = 646103457911 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 (646105555463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13813668 + ... + 13860361.

It is an arithmetic number, because the mean of its divisors is an integer number (83077438060).

Almost surely, 2^646105555063 is an apocalyptic number.

646105555063 is a deficient number, since it is larger than the sum of its proper divisors (18513949417).

646105555063 is a wasteful number, since it uses less digits than its factorization.

646105555063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27674697.

The product of its (nonzero) digits is 1620000, while the sum is 46.

The spelling of 646105555063 in words is "six hundred forty-six billion, one hundred five million, five hundred fifty-five thousand, sixty-three".