638682743747 has 8 divisors (see below), whose sum is σ = 646837944000. Its totient is φ = 630529308864.

The previous prime is 638682743719. The next prime is 638682743767. The reversal of 638682743747 is 747347286836.

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 638682743747 - 2³⁴ = 621502874563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638682743767) 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 7 ways as a sum of consecutive naturals, for example, 294629 + ... + 1167977.

It is an arithmetic number, because the mean of its divisors is an integer number (80854743000).

Almost surely, 2^638682743747 is an apocalyptic number.

638682743747 is a deficient number, since it is larger than the sum of its proper divisors (8155200253).

638682743747 is an equidigital number, since it uses as much as digits as its factorization.

638682743747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882685.

The product of its digits is 227598336, while the sum is 65.

The spelling of 638682743747 in words is "six hundred thirty-eight billion, six hundred eighty-two million, seven hundred forty-three thousand, seven hundred forty-seven".