638438283373 has 4 divisors (see below), whose sum is σ = 696478127328. Its totient is φ = 580398439420.

The previous prime is 638438283349. The next prime is 638438283383. The reversal of 638438283373 is 373382834836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638438283373 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638438283383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29019921961 + ... + 29019921982.

It is an arithmetic number, because the mean of its divisors is an integer number (174119531832).

Almost surely, 2^638438283373 is an apocalyptic number.

It is an amenable number.

638438283373 is a deficient number, since it is larger than the sum of its proper divisors (58039843955).

638438283373 is a wasteful number, since it uses less digits than its factorization.

638438283373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58039843954.

The product of its digits is 41803776, while the sum is 58.

The spelling of 638438283373 in words is "six hundred thirty-eight billion, four hundred thirty-eight million, two hundred eighty-three thousand, three hundred seventy-three".