85805563 has 4 divisors (see below), whose sum is σ = 86592880. Its totient is φ = 85018248.

The previous prime is 85805561. The next prime is 85805633. The reversal of 85805563 is 36550858.

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

It is a cyclic number.

It is not a de Polignac number, because 85805563 - 2¹ = 85805561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85805561) 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, 393495 + ... + 393712.

It is an arithmetic number, because the mean of its divisors is an integer number (21648220).

Almost surely, 2^85805563 is an apocalyptic number.

85805563 is a deficient number, since it is larger than the sum of its proper divisors (787317).

85805563 is a wasteful number, since it uses less digits than its factorization.

85805563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787316.

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

The square root of 85805563 is about 9263.1292228922. The cubic root of 85805563 is about 441.0675917877.

It can be divided in two parts, 85805 and 563, that added together give a palindrome (86368).

The spelling of 85805563 in words is "eighty-five million, eight hundred five thousand, five hundred sixty-three".