645436159 has 2 divisors, whose sum is σ = 645436160. Its totient is φ = 645436158.

The previous prime is 645436133. The next prime is 645436171. The reversal of 645436159 is 951634546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645436159 - 2⁷ = 645436031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645436199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322718079 + 322718080.

It is an arithmetic number, because the mean of its divisors is an integer number (322718080).

Almost surely, 2^645436159 is an apocalyptic number.

645436159 is a deficient number, since it is larger than the sum of its proper divisors (1).

645436159 is an equidigital number, since it uses as much as digits as its factorization.

645436159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 43.

The square root of 645436159 is about 25405.4356191741. The cubic root of 645436159 is about 864.2069687179.

The spelling of 645436159 in words is "six hundred forty-five million, four hundred thirty-six thousand, one hundred fifty-nine".