638403270133 has 8 divisors (see below), whose sum is σ = 639083088000. Its totient is φ = 637723590048.

The previous prime is 638403270121. The next prime is 638403270173. The reversal of 638403270133 is 331072304836.

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 638403270133 - 2⁵ = 638403270101 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 (638403270173) 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, 11131710 + ... + 11188912.

It is an arithmetic number, because the mean of its divisors is an integer number (79885386000).

Almost surely, 2^638403270133 is an apocalyptic number.

It is an amenable number.

638403270133 is a deficient number, since it is larger than the sum of its proper divisors (679817867).

638403270133 is a wasteful number, since it uses less digits than its factorization.

638403270133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68891.

The product of its (nonzero) digits is 217728, while the sum is 40.

Adding to 638403270133 its reverse (331072304836), we get a palindrome (969475574969).

The spelling of 638403270133 in words is "six hundred thirty-eight billion, four hundred three million, two hundred seventy thousand, one hundred thirty-three".