638581012633 has 16 divisors (see below), whose sum is σ = 648167659776. Its totient is φ = 629087065920.

The previous prime is 638581012621. The next prime is 638581012637. The reversal of 638581012633 is 336210185836.

638581012633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 638581012633 - 2³⁷ = 501142059161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638581012637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8820460 + ... + 8892562.

It is an arithmetic number, because the mean of its divisors is an integer number (40510478736).

Almost surely, 2^638581012633 is an apocalyptic number.

It is an amenable number.

638581012633 is a deficient number, since it is larger than the sum of its proper divisors (9586647143).

638581012633 is a wasteful number, since it uses less digits than its factorization.

638581012633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72744.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 638581012633 in words is "six hundred thirty-eight billion, five hundred eighty-one million, twelve thousand, six hundred thirty-three".