646160345661 has 4 divisors (see below), whose sum is σ = 861547127552. Its totient is φ = 430773563772.

The previous prime is 646160345659. The next prime is 646160345707. The reversal of 646160345661 is 166543061646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 646160345661 - 2¹ = 646160345659 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646160345661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646160345861) 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 3 ways as a sum of consecutive naturals, for example, 107693390941 + ... + 107693390946.

It is an arithmetic number, because the mean of its divisors is an integer number (215386781888).

Almost surely, 2^646160345661 is an apocalyptic number.

It is an amenable number.

646160345661 is a deficient number, since it is larger than the sum of its proper divisors (215386781891).

646160345661 is a wasteful number, since it uses less digits than its factorization.

646160345661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215386781890.

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 646160345661 in words is "six hundred forty-six billion, one hundred sixty million, three hundred forty-five thousand, six hundred sixty-one".