646342243633 has 2 divisors, whose sum is σ = 646342243634. Its totient is φ = 646342243632.

The previous prime is 646342243499. The next prime is 646342243681. The reversal of 646342243633 is 336342243646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406421550144 + 239920693489 = 637512^2 + 489817^2 .

It is a cyclic number.

It is not a de Polignac number, because 646342243633 - 2²¹ = 646340146481 is a prime.

It is not a weakly prime, because it can be changed into another prime (646342240633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323171121816 + 323171121817.

It is an arithmetic number, because the mean of its divisors is an integer number (323171121817).

Almost surely, 2^646342243633 is an apocalyptic number.

It is an amenable number.

646342243633 is a deficient number, since it is larger than the sum of its proper divisors (1).

646342243633 is an equidigital number, since it uses as much as digits as its factorization.

646342243633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 46.

The spelling of 646342243633 in words is "six hundred forty-six billion, three hundred forty-two million, two hundred forty-three thousand, six hundred thirty-three".