816165419 has 8 divisors (see below), whose sum is σ = 857294592. Its totient is φ = 775506600.

The previous prime is 816165409. The next prime is 816165443. The reversal of 816165419 is 914561618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 816165419 - 2¹² = 816161323 is a prime.

It is a super-2 number, since 2×816165419² = 1332251982342891122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816165409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114029 + ... + 120974.

It is an arithmetic number, because the mean of its divisors is an integer number (107161824).

Almost surely, 2^816165419 is an apocalyptic number.

816165419 is a deficient number, since it is larger than the sum of its proper divisors (41129173).

816165419 is a wasteful number, since it uses less digits than its factorization.

816165419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235177.

The product of its digits is 51840, while the sum is 41.

The square root of 816165419 is about 28568.6089790875. The cubic root of 816165419 is about 934.5288861715.

The spelling of 816165419 in words is "eight hundred sixteen million, one hundred sixty-five thousand, four hundred nineteen".