638403271573 has 8 divisors (see below), whose sum is σ = 654498926048. Its totient is φ = 622364392944.

The previous prime is 638403271549. The next prime is 638403271577. The reversal of 638403271573 is 375172304836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638403271573 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 (638403271577) 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, 14171190 + ... + 14216167.

It is an arithmetic number, because the mean of its divisors is an integer number (81812365756).

Almost surely, 2^638403271573 is an apocalyptic number.

It is an amenable number.

638403271573 is a deficient number, since it is larger than the sum of its proper divisors (16095654475).

638403271573 is a wasteful number, since it uses less digits than its factorization.

638403271573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28387923.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 638403271573 in words is "six hundred thirty-eight billion, four hundred three million, two hundred seventy-one thousand, five hundred seventy-three".