816565477 has 16 divisors (see below), whose sum is σ = 1016305920. Its totient is φ = 638808192.

The previous prime is 816565457. The next prime is 816565501. The reversal of 816565477 is 774565618.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 816565477 - 2¹⁵ = 816532709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816565477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816565417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42313 + ... + 58510.

It is an arithmetic number, because the mean of its divisors is an integer number (63519120).

Almost surely, 2^816565477 is an apocalyptic number.

It is an amenable number.

816565477 is a deficient number, since it is larger than the sum of its proper divisors (199740443).

816565477 is a wasteful number, since it uses less digits than its factorization.

816565477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100932.

The product of its digits is 1411200, while the sum is 49.

The square root of 816565477 is about 28575.6098272635. The cubic root of 816565477 is about 934.6815532164.

The spelling of 816565477 in words is "eight hundred sixteen million, five hundred sixty-five thousand, four hundred seventy-seven".