63944443947 has 4 divisors (see below), whose sum is σ = 85259258600. Its totient is φ = 42629629296.

The previous prime is 63944443891. The next prime is 63944443961. The reversal of 63944443947 is 74934444936.

63944443947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 63944443947 - 2⁶ = 63944443883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63944423947) 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, 10657407322 + ... + 10657407327.

It is an arithmetic number, because the mean of its divisors is an integer number (21314814650).

Almost surely, 2^63944443947 is an apocalyptic number.

63944443947 is a deficient number, since it is larger than the sum of its proper divisors (21314814653).

63944443947 is a wasteful number, since it uses less digits than its factorization.

63944443947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21314814652.

The product of its digits is 31352832, while the sum is 57.

The spelling of 63944443947 in words is "sixty-three billion, nine hundred forty-four million, four hundred forty-three thousand, nine hundred forty-seven".