645442153 has 2 divisors, whose sum is σ = 645442154. Its totient is φ = 645442152.

The previous prime is 645442099. The next prime is 645442157. The reversal of 645442153 is 351244546.

645442153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344176704 + 301265449 = 18552^2 + 17357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645442153 is a prime.

It is not a weakly prime, because it can be changed into another prime (645442157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322721076 + 322721077.

It is an arithmetic number, because the mean of its divisors is an integer number (322721077).

Almost surely, 2^645442153 is an apocalyptic number.

It is an amenable number.

645442153 is a deficient number, since it is larger than the sum of its proper divisors (1).

645442153 is an equidigital number, since it uses as much as digits as its factorization.

645442153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 34.

The square root of 645442153 is about 25405.5535857812. The cubic root of 645442153 is about 864.2096439324.

Adding to 645442153 its reverse (351244546), we get a palindrome (996686699).

The spelling of 645442153 in words is "six hundred forty-five million, four hundred forty-two thousand, one hundred fifty-three".