6851065921 has 8 divisors (see below), whose sum is σ = 7849515200. Its totient is φ = 5857548048.

The previous prime is 6851065883. The next prime is 6851065931. The reversal of 6851065921 is 1295601586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6851065921 - 2²¹ = 6848968769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6851065931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1229871 + ... + 1235428.

It is an arithmetic number, because the mean of its divisors is an integer number (981189400).

Almost surely, 2^6851065921 is an apocalyptic number.

It is an amenable number.

6851065921 is a deficient number, since it is larger than the sum of its proper divisors (998449279).

6851065921 is a wasteful number, since it uses less digits than its factorization.

6851065921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465703.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 6851065921 is about 82771.1660000027. The cubic root of 6851065921 is about 1899.2671154026.

It can be divided in two parts, 68510 and 65921, that added together give a palindrome (134431).

The spelling of 6851065921 in words is "six billion, eight hundred fifty-one million, sixty-five thousand, nine hundred twenty-one".