643166053 has 2 divisors, whose sum is σ = 643166054. Its totient is φ = 643166052.

The previous prime is 643166047. The next prime is 643166063. The reversal of 643166053 is 350661346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636704289 + 6461764 = 25233^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 643166053 - 2¹³ = 643157861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643166033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321583026 + 321583027.

It is an arithmetic number, because the mean of its divisors is an integer number (321583027).

Almost surely, 2^643166053 is an apocalyptic number.

It is an amenable number.

643166053 is a deficient number, since it is larger than the sum of its proper divisors (1).

643166053 is an equidigital number, since it uses as much as digits as its factorization.

643166053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 643166053 is about 25360.7187003839. The cubic root of 643166053 is about 863.1925921381.

The spelling of 643166053 in words is "six hundred forty-three million, one hundred sixty-six thousand, fifty-three".