85006021783 has 4 divisors (see below), whose sum is σ = 85008546640. Its totient is φ = 85003496928.

The previous prime is 85006021777. The next prime is 85006021873. The reversal of 85006021783 is 38712060058.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85006021783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85006021283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1211235 + ... + 1279492.

It is an arithmetic number, because the mean of its divisors is an integer number (21252136660).

Almost surely, 2^85006021783 is an apocalyptic number.

85006021783 is a deficient number, since it is larger than the sum of its proper divisors (2524857).

85006021783 is a wasteful number, since it uses less digits than its factorization.

85006021783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524856.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 85006021783 in words is "eighty-five billion, six million, twenty-one thousand, seven hundred eighty-three".