85305661 has 4 divisors (see below), whose sum is σ = 97492192. Its totient is φ = 73119132.

The previous prime is 85305659. The next prime is 85305667. The reversal of 85305661 is 16650358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16650358 = 2 ⋅8325179.

It is a cyclic number.

It is not a de Polignac number, because 85305661 - 2¹ = 85305659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85305667) 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, 6093255 + ... + 6093268.

It is an arithmetic number, because the mean of its divisors is an integer number (24373048).

Almost surely, 2^85305661 is an apocalyptic number.

It is an amenable number.

85305661 is a deficient number, since it is larger than the sum of its proper divisors (12186531).

85305661 is a wasteful number, since it uses less digits than its factorization.

85305661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12186530.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 85305661 is about 9236.1063766070. The cubic root of 85305661 is about 440.2093717744.

The spelling of 85305661 in words is "eighty-five million, three hundred five thousand, six hundred sixty-one".