869820850771 has 4 divisors (see below), whose sum is σ = 869966971432. Its totient is φ = 869674730112.

The previous prime is 869820850699. The next prime is 869820850777. The reversal of 869820850771 is 177058028968.

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

It is a cyclic number.

It is not a de Polignac number, because 869820850771 - 2⁹ = 869820850259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869820850777) 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, 73051401 + ... + 73063306.

It is an arithmetic number, because the mean of its divisors is an integer number (217491742858).

Almost surely, 2^869820850771 is an apocalyptic number.

869820850771 is a deficient number, since it is larger than the sum of its proper divisors (146120661).

869820850771 is a wasteful number, since it uses less digits than its factorization.

869820850771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146120660.

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 869820850771 in words is "eight hundred sixty-nine billion, eight hundred twenty million, eight hundred fifty thousand, seven hundred seventy-one".