638636201147 has 4 divisors (see below), whose sum is σ = 729869944176. Its totient is φ = 547402458120.

The previous prime is 638636201011. The next prime is 638636201167. The reversal of 638636201147 is 741102636836.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 638636201147 - 2¹⁶ = 638636135611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638636201167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45616871504 + ... + 45616871517.

It is an arithmetic number, because the mean of its divisors is an integer number (182467486044).

Almost surely, 2^638636201147 is an apocalyptic number.

638636201147 is a deficient number, since it is larger than the sum of its proper divisors (91233743029).

638636201147 is an equidigital number, since it uses as much as digits as its factorization.

638636201147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91233743028.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 638636201147 in words is "six hundred thirty-eight billion, six hundred thirty-six million, two hundred one thousand, one hundred forty-seven".