85366643 has 4 divisors (see below), whose sum is σ = 86640840. Its totient is φ = 84092448.

The previous prime is 85366621. The next prime is 85366649. The reversal of 85366643 is 34666358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34666358 = 2 ⋅17333179.

It is a cyclic number.

It is not a de Polignac number, because 85366643 - 2¹⁶ = 85301107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85366643.

It is not an unprimeable number, because it can be changed into a prime (85366649) 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, 636998 + ... + 637131.

It is an arithmetic number, because the mean of its divisors is an integer number (21660210).

Almost surely, 2^85366643 is an apocalyptic number.

85366643 is a deficient number, since it is larger than the sum of its proper divisors (1274197).

85366643 is a wasteful number, since it uses less digits than its factorization.

85366643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274196.

The product of its digits is 311040, while the sum is 41.

The square root of 85366643 is about 9239.4070697204. The cubic root of 85366643 is about 440.3142434923.

The spelling of 85366643 in words is "eighty-five million, three hundred sixty-six thousand, six hundred forty-three".