6851860061 has 4 divisors (see below), whose sum is σ = 6854628732. Its totient is φ = 6849091392.

The previous prime is 6851860027. The next prime is 6851860091. The reversal of 6851860061 is 1600681586.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2951857561 + 3900002500 = 54331^2 + 62450^2 .

It is a cyclic number.

It is not a de Polignac number, because 6851860061 - 2¹⁸ = 6851597917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6851860021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1380620 + ... + 1385573.

It is an arithmetic number, because the mean of its divisors is an integer number (1713657183).

Almost surely, 2^6851860061 is an apocalyptic number.

It is an amenable number.

6851860061 is a deficient number, since it is larger than the sum of its proper divisors (2768671).

6851860061 is a wasteful number, since it uses less digits than its factorization.

6851860061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768670.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 6851860061 is about 82775.9630629569. The cubic root of 6851860061 is about 1899.3404969626.

The spelling of 6851860061 in words is "six billion, eight hundred fifty-one million, eight hundred sixty thousand, sixty-one".