85665541 has 4 divisors (see below), whose sum is σ = 92255212. Its totient is φ = 79075872.

The previous prime is 85665527. The next prime is 85665551. The reversal of 85665541 is 14556658.

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 14853316 + 70812225 = 3854^2 + 8415^2 .

It is a cyclic number.

It is not a de Polignac number, because 85665541 - 2⁹ = 85665029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85665494 and 85665503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85665521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3294816 + ... + 3294841.

It is an arithmetic number, because the mean of its divisors is an integer number (23063803).

Almost surely, 2^85665541 is an apocalyptic number.

It is an amenable number.

85665541 is a deficient number, since it is larger than the sum of its proper divisors (6589671).

85665541 is a wasteful number, since it uses less digits than its factorization.

85665541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6589670.

The product of its digits is 144000, while the sum is 40.

The square root of 85665541 is about 9255.5681079013. The cubic root of 85665541 is about 440.8275421195.

The spelling of 85665541 in words is "eighty-five million, six hundred sixty-five thousand, five hundred forty-one".