855209669 has 4 divisors (see below), whose sum is σ = 855272640. Its totient is φ = 855146700.

The previous prime is 855209659. The next prime is 855209689. The reversal of 855209669 is 966902558.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 855209669 - 2¹⁶ = 855144133 is a prime.

It is a super-2 number, since 2×855209669² = 1462767155902179122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855209609) 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, 1757 + ... + 41394.

It is an arithmetic number, because the mean of its divisors is an integer number (213818160).

Almost surely, 2^855209669 is an apocalyptic number.

It is an amenable number.

855209669 is a deficient number, since it is larger than the sum of its proper divisors (62971).

855209669 is a wasteful number, since it uses less digits than its factorization.

855209669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62970.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 855209669 is about 29243.9680789048. The cubic root of 855209669 is about 949.1995728771.

The spelling of 855209669 in words is "eight hundred fifty-five million, two hundred nine thousand, six hundred sixty-nine".