85564681 has 4 divisors (see below), whose sum is σ = 88324864. Its totient is φ = 82804500.

The previous prime is 85564667. The next prime is 85564693. The reversal of 85564681 is 18646558.

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.

It is a cyclic number.

It is not a de Polignac number, because 85564681 - 2⁵ = 85564649 is a prime.

It is a super-2 number, since 2×85564681² = 14642629269263522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85564081) 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, 1380045 + ... + 1380106.

It is an arithmetic number, because the mean of its divisors is an integer number (22081216).

Almost surely, 2^85564681 is an apocalyptic number.

It is an amenable number.

85564681 is a deficient number, since it is larger than the sum of its proper divisors (2760183).

85564681 is a wasteful number, since it uses less digits than its factorization.

85564681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760182.

The product of its digits is 230400, while the sum is 43.

The square root of 85564681 is about 9250.1178911406. The cubic root of 85564681 is about 440.6544685353.

It can be divided in two parts, 855 and 64681, that added together give a 16-th power (65536 = 2¹⁶).

The spelling of 85564681 in words is "eighty-five million, five hundred sixty-four thousand, six hundred eighty-one".