6165781978 has 8 divisors (see below), whose sum is σ = 9319273920. Its totient is φ = 3059357340.

The previous prime is 6165781957. The next prime is 6165781981. The reversal of 6165781978 is 8791875616.

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

It is an unprimeable number.

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, 11766498 + ... + 11767021.

It is an arithmetic number, because the mean of its divisors is an integer number (1164909240).

Almost surely, 2^6165781978 is an apocalyptic number.

6165781978 is a deficient number, since it is larger than the sum of its proper divisors (3153491942).

6165781978 is a wasteful number, since it uses less digits than its factorization.

6165781978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23533652.

The product of its digits is 5080320, while the sum is 58.

The square root of 6165781978 is about 78522.4934525133. The cubic root of 6165781978 is about 1833.7046572240.

The spelling of 6165781978 in words is "six billion, one hundred sixty-five million, seven hundred eighty-one thousand, nine hundred seventy-eight".