9918523878 has 32 divisors (see below), whose sum is σ = 20370759552. Its totient is φ = 3217771200.

The previous prime is 9918523871. The next prime is 9918523883. The reversal of 9918523878 is 8783258199.

9918523878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918523871) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4093 + ... + 140903.

It is an arithmetic number, because the mean of its divisors is an integer number (636586236).

Almost surely, 2^9918523878 is an apocalyptic number.

9918523878 is an abundant number, since it is smaller than the sum of its proper divisors (10452235674).

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

9918523878 is a wasteful number, since it uses less digits than its factorization.

9918523878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137140.

The product of its digits is 8709120, while the sum is 60.

The square root of 9918523878 is about 99591.7861974571. The cubic root of 9918523878 is about 2148.5675605766.

The spelling of 9918523878 in words is "nine billion, nine hundred eighteen million, five hundred twenty-three thousand, eight hundred seventy-eight".