618869869 has 2 divisors, whose sum is σ = 618869870. Its totient is φ = 618869868.

The previous prime is 618869851. The next prime is 618869893. The reversal of 618869869 is 968968816.

618869869 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., 452072644 + 166797225 = 21262^2 + 12915^2 .

It is a cyclic number.

It is not a de Polignac number, because 618869869 - 2⁹ = 618869357 is a prime.

It is a super-2 number, since 2×618869869² = 765999829512154322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618869899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309434934 + 309434935.

It is an arithmetic number, because the mean of its divisors is an integer number (309434935).

Almost surely, 2^618869869 is an apocalyptic number.

It is an amenable number.

618869869 is a deficient number, since it is larger than the sum of its proper divisors (1).

618869869 is an equidigital number, since it uses as much as digits as its factorization.

618869869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 61.

The square root of 618869869 is about 24877.0952685397. The cubic root of 618869869 is about 852.1834838320.

The spelling of 618869869 in words is "six hundred eighteen million, eight hundred sixty-nine thousand, eight hundred sixty-nine".