646093979161 has 8 divisors (see below), whose sum is σ = 658309312584. Its totient is φ = 633879567360.

The previous prime is 646093979159. The next prime is 646093979171. The reversal of 646093979161 is 161979390646.

It can be written as a sum of positive squares in 4 ways, for example, as 138607290000 + 507486689161 = 372300^2 + 712381^2 .

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 646093979161 - 2¹ = 646093979159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646093979161.

It is not an unprimeable number, because it can be changed into a prime (646093979171) 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, 1277305 + ... + 1709881.

It is an arithmetic number, because the mean of its divisors is an integer number (82288664073).

Almost surely, 2^646093979161 is an apocalyptic number.

It is an amenable number.

646093979161 is a deficient number, since it is larger than the sum of its proper divisors (12215333423).

646093979161 is a wasteful number, since it uses less digits than its factorization.

646093979161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460811.

The product of its (nonzero) digits is 13226976, while the sum is 61.

The spelling of 646093979161 in words is "six hundred forty-six billion, ninety-three million, nine hundred seventy-nine thousand, one hundred sixty-one".