646622252341 has 4 divisors (see below), whose sum is σ = 696362425612. Its totient is φ = 596882079072.

The previous prime is 646622252291. The next prime is 646622252347. The reversal of 646622252341 is 143252226646.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101933971441 + 544688280900 = 319271^2 + 738030^2 .

It is a cyclic number.

It is not a de Polignac number, because 646622252341 - 2⁹ = 646622251829 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 (646622252347) 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, 24870086616 + ... + 24870086641.

It is an arithmetic number, because the mean of its divisors is an integer number (174090606403).

Almost surely, 2^646622252341 is an apocalyptic number.

It is an amenable number.

646622252341 is a deficient number, since it is larger than the sum of its proper divisors (49740173271).

646622252341 is a wasteful number, since it uses less digits than its factorization.

646622252341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49740173270.

The product of its digits is 829440, while the sum is 43.

Adding to 646622252341 its reverse (143252226646), we get a palindrome (789874478987).

The spelling of 646622252341 in words is "six hundred forty-six billion, six hundred twenty-two million, two hundred fifty-two thousand, three hundred forty-one".