638165546 has 8 divisors (see below), whose sum is σ = 966542304. Its totient is φ = 315984780.

The previous prime is 638165531. The next prime is 638165551. The reversal of 638165546 is 645561836.

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

It is a junction number, because it is equal to n+sod(n) for n = 638165497 and 638165506.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1548740 + ... + 1549151.

It is an arithmetic number, because the mean of its divisors is an integer number (120817788).

Almost surely, 2^638165546 is an apocalyptic number.

638165546 is a deficient number, since it is larger than the sum of its proper divisors (328376758).

638165546 is a wasteful number, since it uses less digits than its factorization.

638165546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097996.

The product of its digits is 518400, while the sum is 44.

The square root of 638165546 is about 25261.9386825319. The cubic root of 638165546 is about 860.9497107046.

The spelling of 638165546 in words is "six hundred thirty-eight million, one hundred sixty-five thousand, five hundred forty-six".