643226702029 has 2 divisors, whose sum is σ = 643226702030. Its totient is φ = 643226702028.

The previous prime is 643226701963. The next prime is 643226702081. The reversal of 643226702029 is 920207622346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 471103776900 + 172122925129 = 686370^2 + 414877^2 .

It is a cyclic number.

It is not a de Polignac number, because 643226702029 - 2¹¹ = 643226699981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643226702089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321613351014 + 321613351015.

It is an arithmetic number, because the mean of its divisors is an integer number (321613351015).

Almost surely, 2^643226702029 is an apocalyptic number.

It is an amenable number.

643226702029 is a deficient number, since it is larger than the sum of its proper divisors (1).

643226702029 is an equidigital number, since it uses as much as digits as its factorization.

643226702029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 643226702029 in words is "six hundred forty-three billion, two hundred twenty-six million, seven hundred two thousand, twenty-nine".