836664865 has 4 divisors (see below), whose sum is σ = 1003997844. Its totient is φ = 669331888.

The previous prime is 836664863. The next prime is 836664883. The reversal of 836664865 is 568466638.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 369715984 + 466948881 = 19228^2 + 21609^2 .

It is a cyclic number.

It is not a de Polignac number, because 836664865 - 2¹ = 836664863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (836664863) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 83666482 + ... + 83666491.

It is an arithmetic number, because the mean of its divisors is an integer number (250999461).

Almost surely, 2^836664865 is an apocalyptic number.

It is an amenable number.

836664865 is a deficient number, since it is larger than the sum of its proper divisors (167332979).

836664865 is a wasteful number, since it uses less digits than its factorization.

836664865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167332978.

The product of its digits is 4976640, while the sum is 52.

The square root of 836664865 is about 28925.1597229817. The cubic root of 836664865 is about 942.2883979697.

The spelling of 836664865 in words is "eight hundred thirty-six million, six hundred sixty-four thousand, eight hundred sixty-five".