638253145717 has 8 divisors (see below), whose sum is σ = 697862214720. Its totient is φ = 578908419360.

The previous prime is 638253145709. The next prime is 638253145757. The reversal of 638253145717 is 717541352836.

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

It is a cyclic number.

It is not a de Polignac number, because 638253145717 - 2³ = 638253145709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638253145757) 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, 66080608 + ... + 66090265.

It is an arithmetic number, because the mean of its divisors is an integer number (87232776840).

Almost surely, 2^638253145717 is an apocalyptic number.

It is an amenable number.

638253145717 is a deficient number, since it is larger than the sum of its proper divisors (59609069003).

638253145717 is a wasteful number, since it uses less digits than its factorization.

638253145717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132171323.

The product of its digits is 4233600, while the sum is 52.

The spelling of 638253145717 in words is "six hundred thirty-eight billion, two hundred fifty-three million, one hundred forty-five thousand, seven hundred seventeen".