6165921861 has 12 divisors (see below), whose sum is σ = 9715998240. Its totient is φ = 3736922280.

The previous prime is 6165921847. The next prime is 6165921863. The reversal of 6165921861 is 1681295616.

6165921861 is a `hidden beast` number, since 616 + 5 + 9 + 21 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 6165921861 - 2¹⁴ = 6165905477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6165921863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31140921 + ... + 31141118.

It is an arithmetic number, because the mean of its divisors is an integer number (809666520).

Almost surely, 2^6165921861 is an apocalyptic number.

It is an amenable number.

6165921861 is a deficient number, since it is larger than the sum of its proper divisors (3550076379).

6165921861 is a wasteful number, since it uses less digits than its factorization.

6165921861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62282056 (or 62282053 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 6165921861 is about 78523.3841667563. The cubic root of 6165921861 is about 1833.7185241955.

The spelling of 6165921861 in words is "six billion, one hundred sixty-five million, nine hundred twenty-one thousand, eight hundred sixty-one".