646271585172646 has 4 divisors (see below), whose sum is σ = 969407377758972. Its totient is φ = 323135792586322.

The previous prime is 646271585172641. The next prime is 646271585172649.

646271585172646 is nontrivially palindromic in base 10.

646271585172646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646271585172641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161567896293160 + ... + 161567896293163.

It is an arithmetic number, because the mean of its divisors is an integer number (242351844439743).

Almost surely, 2^{646271585172646} is an apocalyptic number.

646271585172646 is a deficient number, since it is larger than the sum of its proper divisors (323135792586326).

646271585172646 is a wasteful number, since it uses less digits than its factorization.

646271585172646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323135792586325.

The product of its digits is 812851200, while the sum is 70.

The spelling of 646271585172646 in words is "six hundred forty-six trillion, two hundred seventy-one billion, five hundred eighty-five million, one hundred seventy-two thousand, six hundred forty-six".