643373677 has 2 divisors, whose sum is σ = 643373678. Its totient is φ = 643373676.

The previous prime is 643373663. The next prime is 643373693. The reversal of 643373677 is 776373346.

It is a happy number.

643373677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640039401 + 3334276 = 25299^2 + 1826^2 .

It is a cyclic number.

It is not a de Polignac number, because 643373677 - 2¹¹ = 643371629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643373617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321686838 + 321686839.

It is an arithmetic number, because the mean of its divisors is an integer number (321686839).

Almost surely, 2^643373677 is an apocalyptic number.

It is an amenable number.

643373677 is a deficient number, since it is larger than the sum of its proper divisors (1).

643373677 is an equidigital number, since it uses as much as digits as its factorization.

643373677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 46.

The square root of 643373677 is about 25364.8117871984. The cubic root of 643373677 is about 863.2854661408.

It can be divided in two parts, 6 and 43373677, that multiplied together give a palindrome (260242062).

The spelling of 643373677 in words is "six hundred forty-three million, three hundred seventy-three thousand, six hundred seventy-seven".