1605909822879 has 16 divisors (see below), whose sum is σ = 2181509124480. Its totient is φ = 1050542312160.

The previous prime is 1605909822871. The next prime is 1605909822929. The reversal of 1605909822879 is 9782289095061.

It is a happy number.

It is not a de Polignac number, because 1605909822879 - 2³ = 1605909822871 is a prime.

It is a super-2 number, since 2×1605909822879² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605909822871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10395237 + ... + 10548590.

It is an arithmetic number, because the mean of its divisors is an integer number (136344320280).

Almost surely, 2^{1605909822879} is an apocalyptic number.

1605909822879 is a deficient number, since it is larger than the sum of its proper divisors (575599301601).

1605909822879 is a wasteful number, since it uses less digits than its factorization.

1605909822879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20944310.

The product of its (nonzero) digits is 39191040, while the sum is 66.

The spelling of 1605909822879 in words is "one trillion, six hundred five billion, nine hundred nine million, eight hundred twenty-two thousand, eight hundred seventy-nine".