645552269 has 2 divisors, whose sum is σ = 645552270. Its totient is φ = 645552268.

The previous prime is 645552251. The next prime is 645552301. The reversal of 645552269 is 962255546.

645552269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538843369 + 106708900 = 23213^2 + 10330^2 .

It is a cyclic number.

It is not a de Polignac number, because 645552269 - 2¹² = 645548173 is a prime.

It is a super-2 number, since 2×645552269² = 833475464022096722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645512269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322776134 + 322776135.

It is an arithmetic number, because the mean of its divisors is an integer number (322776135).

Almost surely, 2^645552269 is an apocalyptic number.

It is an amenable number.

645552269 is a deficient number, since it is larger than the sum of its proper divisors (1).

645552269 is an equidigital number, since it uses as much as digits as its factorization.

645552269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 44.

The square root of 645552269 is about 25407.7206573120. The cubic root of 645552269 is about 864.2587874523.

The spelling of 645552269 in words is "six hundred forty-five million, five hundred fifty-two thousand, two hundred sixty-nine".