638131883331 has 8 divisors (see below), whose sum is σ = 850847417680. Its totient is φ = 425418802272.

The previous prime is 638131883327. The next prime is 638131883341. The reversal of 638131883331 is 133388131836.

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

It is not a de Polignac number, because 638131883331 - 2² = 638131883327 is a prime.

It is a super-2 number, since 2×638131883331² (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 (638131883321) 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, 118281 + ... + 1135893.

It is an arithmetic number, because the mean of its divisors is an integer number (106355927210).

Almost surely, 2^638131883331 is an apocalyptic number.

638131883331 is a deficient number, since it is larger than the sum of its proper divisors (212715534349).

638131883331 is a wasteful number, since it uses less digits than its factorization.

638131883331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226645.

The product of its digits is 746496, while the sum is 48.

The spelling of 638131883331 in words is "six hundred thirty-eight billion, one hundred thirty-one million, eight hundred eighty-three thousand, three hundred thirty-one".