6920168138 has 64 divisors (see below), whose sum is σ = 12005431200. Its totient is φ = 2963423232.

The previous prime is 6920168137. The next prime is 6920168179. The reversal of 6920168138 is 8318610296.

It can be written as a sum of positive squares in 16 ways, for example, as 352200289 + 6567967849 = 18767^2 + 81043^2 .

It is not an unprimeable number, because it can be changed into a prime (6920168137) 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 31 ways as a sum of consecutive naturals, for example, 17430956 + ... + 17431352.

Almost surely, 2^6920168138 is an apocalyptic number.

6920168138 is a deficient number, since it is larger than the sum of its proper divisors (5085263062).

6920168138 is a wasteful number, since it uses less digits than its factorization.

6920168138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 6920168138 is about 83187.5479744415. The cubic root of 6920168138 is about 1905.6313206206.

The spelling of 6920168138 in words is "six billion, nine hundred twenty million, one hundred sixty-eight thousand, one hundred thirty-eight".