638081841833 has 8 divisors (see below), whose sum is σ = 648856072800. Its totient is φ = 627387717088.

The previous prime is 638081841823. The next prime is 638081841883. The reversal of 638081841833 is 338148180836.

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

It is not a de Polignac number, because 638081841833 - 2⁶ = 638081841769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638081841823) 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, 20010491 + ... + 20042352.

It is an arithmetic number, because the mean of its divisors is an integer number (81107009100).

Almost surely, 2^638081841833 is an apocalyptic number.

It is an amenable number.

638081841833 is a deficient number, since it is larger than the sum of its proper divisors (10774230967).

638081841833 is a wasteful number, since it uses less digits than its factorization.

638081841833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40053111.

The product of its (nonzero) digits is 2654208, while the sum is 53.

The spelling of 638081841833 in words is "six hundred thirty-eight billion, eighty-one million, eight hundred forty-one thousand, eight hundred thirty-three".