638820143061 has 8 divisors (see below), whose sum is σ = 851763917664. Its totient is φ = 425878231920.

The previous prime is 638820143023. The next prime is 638820143063. The reversal of 638820143061 is 160341028836.

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

It is not a de Polignac number, because 638820143061 - 2¹⁵ = 638820110293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638820143063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940846 + ... + 1470656.

It is an arithmetic number, because the mean of its divisors is an integer number (106470489708).

Almost surely, 2^638820143061 is an apocalyptic number.

It is an amenable number.

638820143061 is a deficient number, since it is larger than the sum of its proper divisors (212943774603).

638820143061 is a wasteful number, since it uses less digits than its factorization.

638820143061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931731.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 638820143061 in words is "six hundred thirty-eight billion, eight hundred twenty million, one hundred forty-three thousand, sixty-one".