85005561 has 8 divisors (see below), whose sum is σ = 113464224. Its totient is φ = 56608640.

The previous prime is 85005553. The next prime is 85005617. The reversal of 85005561 is 16550058.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 85005561 - 2³ = 85005553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85005511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12120 + ... + 17801.

It is an arithmetic number, because the mean of its divisors is an integer number (14183028).

Almost surely, 2^85005561 is an apocalyptic number.

It is an amenable number.

85005561 is a deficient number, since it is larger than the sum of its proper divisors (28458663).

85005561 is a wasteful number, since it uses less digits than its factorization.

85005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30871.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 85005561 is about 9219.8460399293. The cubic root of 85005561 is about 439.6925555439.

The spelling of 85005561 in words is "eighty-five million, five thousand, five hundred sixty-one".