646223071 has 4 divisors (see below), whose sum is σ = 695932552. Its totient is φ = 596513592.

The previous prime is 646223059. The next prime is 646223089. The reversal of 646223071 is 170322646.

646223071 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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646223071 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 (646223051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24854721 + ... + 24854746.

It is an arithmetic number, because the mean of its divisors is an integer number (173983138).

Almost surely, 2^646223071 is an apocalyptic number.

646223071 is a deficient number, since it is larger than the sum of its proper divisors (49709481).

646223071 is a wasteful number, since it uses less digits than its factorization.

646223071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49709480.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 646223071 is about 25420.9179810643. The cubic root of 646223071 is about 864.5580381143.

The spelling of 646223071 in words is "six hundred forty-six million, two hundred twenty-three thousand, seventy-one".