638010155 has 4 divisors (see below), whose sum is σ = 765612192. Its totient is φ = 510408120.

The previous prime is 638010089. The next prime is 638010157. The reversal of 638010155 is 551010836.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 638010155 - 2⁸ = 638009899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638010157) 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 3 ways as a sum of consecutive naturals, for example, 63801011 + ... + 63801020.

It is an arithmetic number, because the mean of its divisors is an integer number (191403048).

Almost surely, 2^638010155 is an apocalyptic number.

638010155 is a deficient number, since it is larger than the sum of its proper divisors (127602037).

638010155 is a wasteful number, since it uses less digits than its factorization.

638010155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127602036.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 638010155 is about 25258.8628999803. The cubic root of 638010155 is about 860.8798256528.

The spelling of 638010155 in words is "six hundred thirty-eight million, ten thousand, one hundred fifty-five".