1820266369 has 2 divisors, whose sum is σ = 1820266370. Its totient is φ = 1820266368.

The previous prime is 1820266351. The next prime is 1820266421. The reversal of 1820266369 is 9636620281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1686169969 + 134096400 = 41063^2 + 11580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820266369 - 2¹⁷ = 1820135297 is a prime.

It is a super-2 number, since 2×1820266369² = 6626739308224888322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1820266769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910133184 + 910133185.

It is an arithmetic number, because the mean of its divisors is an integer number (910133185).

Almost surely, 2^1820266369 is an apocalyptic number.

It is an amenable number.

1820266369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820266369 is an equidigital number, since it uses as much as digits as its factorization.

1820266369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 1820266369 is about 42664.5797940165. The cubic root of 1820266369 is about 1220.9887105182.

The spelling of 1820266369 in words is "one billion, eight hundred twenty million, two hundred sixty-six thousand, three hundred sixty-nine".