638166162 has 16 divisors (see below), whose sum is σ = 1351410912. Its totient is φ = 200208960.

The previous prime is 638166161. The next prime is 638166203. The reversal of 638166162 is 261661836.

It is a self number, because there is not a number n which added to its sum of digits gives 638166162.

It is not an unprimeable number, because it can be changed into a prime (638166161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3128164 + ... + 3128367.

It is an arithmetic number, because the mean of its divisors is an integer number (84463182).

Almost surely, 2^638166162 is an apocalyptic number.

638166162 is an abundant number, since it is smaller than the sum of its proper divisors (713244750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638166162 is a wasteful number, since it uses less digits than its factorization.

638166162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6256553.

The product of its digits is 62208, while the sum is 39.

The square root of 638166162 is about 25261.9508747840. The cubic root of 638166162 is about 860.9499877199.

The spelling of 638166162 in words is "six hundred thirty-eight million, one hundred sixty-six thousand, one hundred sixty-two".