63997448887 has 4 divisors (see below), whose sum is σ = 64039251496. Its totient is φ = 63955646280.

The previous prime is 63997448873. The next prime is 63997448939. The reversal of 63997448887 is 78884479936.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63997448887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63997448087) 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, 20899008 + ... + 20902069.

It is an arithmetic number, because the mean of its divisors is an integer number (16009812874).

Almost surely, 2^63997448887 is an apocalyptic number.

63997448887 is a deficient number, since it is larger than the sum of its proper divisors (41802609).

63997448887 is a wasteful number, since it uses less digits than its factorization.

63997448887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41802608.

The product of its digits is 585252864, while the sum is 73.

The spelling of 63997448887 in words is "sixty-three billion, nine hundred ninety-seven million, four hundred forty-eight thousand, eight hundred eighty-seven".