638351607612 has 12 divisors (see below), whose sum is σ = 1489487084456. Its totient is φ = 212783869200.

The previous prime is 638351607599. The next prime is 638351607617. The reversal of 638351607612 is 216706153836.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638351607617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26597983639 + ... + 26597983662.

Almost surely, 2^638351607612 is an apocalyptic number.

It is an amenable number.

638351607612 is an abundant number, since it is smaller than the sum of its proper divisors (851135476844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638351607612 is a wasteful number, since it uses less digits than its factorization.

638351607612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53195967308 (or 53195967306 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 638351607612 in words is "six hundred thirty-eight billion, three hundred fifty-one million, six hundred seven thousand, six hundred twelve".