6166778389 has 8 divisors (see below), whose sum is σ = 6319533528. Its totient is φ = 6014135040.

The previous prime is 6166778383. The next prime is 6166778411. The reversal of 6166778389 is 9838776616.

It can be written as a sum of positive squares in 4 ways, for example, as 60606225 + 6106172164 = 7785^2 + 78142^2 .

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 6166778389 - 2³ = 6166778381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6166778381) 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, 89809 + ... + 142825.

It is an arithmetic number, because the mean of its divisors is an integer number (789941691).

Almost surely, 2^6166778389 is an apocalyptic number.

It is an amenable number.

6166778389 is a deficient number, since it is larger than the sum of its proper divisors (152755139).

6166778389 is a wasteful number, since it uses less digits than its factorization.

6166778389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55895.

The product of its digits is 18289152, while the sum is 61.

The square root of 6166778389 is about 78528.8379450505. The cubic root of 6166778389 is about 1833.8034295064.

The spelling of 6166778389 in words is "six billion, one hundred sixty-six million, seven hundred seventy-eight thousand, three hundred eighty-nine".