646111085 has 8 divisors (see below), whose sum is σ = 788044056. Its totient is φ = 508415040.

The previous prime is 646111073. The next prime is 646111099. The reversal of 646111085 is 580111646.

It can be written as a sum of positive squares in 4 ways, for example, as 69438889 + 576672196 = 8333^2 + 24014^2 .

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

It is not a de Polignac number, because 646111085 - 2¹⁰ = 646110061 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 1058894 + ... + 1059503.

It is an arithmetic number, because the mean of its divisors is an integer number (98505507).

Almost surely, 2^646111085 is an apocalyptic number.

It is an amenable number.

646111085 is a deficient number, since it is larger than the sum of its proper divisors (141932971).

646111085 is a wasteful number, since it uses less digits than its factorization.

646111085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118463.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 646111085 is about 25418.7152507754. The cubic root of 646111085 is about 864.5080945814.

The spelling of 646111085 in words is "six hundred forty-six million, one hundred eleven thousand, eighty-five".