646255206601 has 8 divisors (see below), whose sum is σ = 684278781984. Its totient is φ = 608232582720.

The previous prime is 646255206559. The next prime is 646255206607. The reversal of 646255206601 is 106602552646.

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 646255206601 - 2⁹ = 646255206089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646255206607) 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, 1540326 + ... + 1914448.

It is an arithmetic number, because the mean of its divisors is an integer number (85534847748).

Almost surely, 2^646255206601 is an apocalyptic number.

It is an amenable number.

646255206601 is a deficient number, since it is larger than the sum of its proper divisors (38023575383).

646255206601 is a wasteful number, since it uses less digits than its factorization.

646255206601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475751.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 646255206601 in words is "six hundred forty-six billion, two hundred fifty-five million, two hundred six thousand, six hundred one".