63438975878 has 4 divisors (see below), whose sum is σ = 95158463820. Its totient is φ = 31719487938.

The previous prime is 63438975851. The next prime is 63438975883. The reversal of 63438975878 is 87857983436.

63438975878 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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15859743968 + ... + 15859743971.

It is an arithmetic number, because the mean of its divisors is an integer number (23789615955).

Almost surely, 2^63438975878 is an apocalyptic number.

63438975878 is a deficient number, since it is larger than the sum of its proper divisors (31719487942).

63438975878 is a wasteful number, since it uses less digits than its factorization.

63438975878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31719487941.

The product of its digits is 243855360, while the sum is 68.

The spelling of 63438975878 in words is "sixty-three billion, four hundred thirty-eight million, nine hundred seventy-five thousand, eight hundred seventy-eight".