63871668872 has 36 divisors (see below), whose sum is σ = 131652549735. Its totient is φ = 29029002640.

The previous prime is 63871668859. The next prime is 63871668961. The reversal of 63871668872 is 27886617836.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 31935834436 + 31935834436 = 178706^2 + 178706^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=178706.

It is a Duffinian number.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 7859003 + ... + 7867125.

Almost surely, 2^63871668872 is an apocalyptic number.

It is an amenable number.

63871668872 is an abundant number, since it is smaller than the sum of its proper divisors (67780880863).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63871668872 is an frugal number, since it uses more digits than its factorization.

63871668872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16274 (or 8136 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 62.

The spelling of 63871668872 in words is "sixty-three billion, eight hundred seventy-one million, six hundred sixty-eight thousand, eight hundred seventy-two".