645446111 has 2 divisors, whose sum is σ = 645446112. Its totient is φ = 645446110.

The previous prime is 645446057. The next prime is 645446129. The reversal of 645446111 is 111644546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645446111 - 2¹⁴ = 645429727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645446141) 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 as a sum of consecutive naturals, namely, 322723055 + 322723056.

It is an arithmetic number, because the mean of its divisors is an integer number (322723056).

Almost surely, 2^645446111 is an apocalyptic number.

645446111 is a deficient number, since it is larger than the sum of its proper divisors (1).

645446111 is an equidigital number, since it uses as much as digits as its factorization.

645446111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 645446111 is about 25405.6314820160. The cubic root of 645446111 is about 864.2114104397.

The spelling of 645446111 in words is "six hundred forty-five million, four hundred forty-six thousand, one hundred eleven".