816161775 has 48 divisors (see below), whose sum is σ = 1585315200. Its totient is φ = 365270400.

The previous prime is 816161767. The next prime is 816161813. The reversal of 816161775 is 577161618.

It is a happy number.

It is not a de Polignac number, because 816161775 - 2³ = 816161767 is a prime.

It is a super-2 number, since 2×816161775² = 1332240085942301250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 47 ways as a sum of consecutive naturals, for example, 27325 + ... + 48774.

It is an arithmetic number, because the mean of its divisors is an integer number (33027400).

Almost surely, 2^816161775 is an apocalyptic number.

816161775 is a deficient number, since it is larger than the sum of its proper divisors (769153425).

816161775 is a wasteful number, since it uses less digits than its factorization.

816161775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76136 (or 76131 counting only the distinct ones).

The product of its digits is 70560, while the sum is 42.

The square root of 816161775 is about 28568.5452027225. The cubic root of 816161775 is about 934.5274953471.

The spelling of 816161775 in words is "eight hundred sixteen million, one hundred sixty-one thousand, seven hundred seventy-five".