638634282505 has 8 divisors (see below), whose sum is σ = 799681188672. Its totient is φ = 488694059568.

The previous prime is 638634282493. The next prime is 638634282509. The reversal of 638634282505 is 505282436836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638634282505 is a prime.

It is a super-2 number, since 2×638634282505² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638634282509) 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 7 ways as a sum of consecutive naturals, for example, 2776670679 + ... + 2776670908.

It is an arithmetic number, because the mean of its divisors is an integer number (99960148584).

Almost surely, 2^638634282505 is an apocalyptic number.

It is an amenable number.

638634282505 is a deficient number, since it is larger than the sum of its proper divisors (161046906167).

638634282505 is a wasteful number, since it uses less digits than its factorization.

638634282505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553341615.

The product of its (nonzero) digits is 8294400, while the sum is 52.

The spelling of 638634282505 in words is "six hundred thirty-eight billion, six hundred thirty-four million, two hundred eighty-two thousand, five hundred five".