66493123878 has 16 divisors (see below), whose sum is σ = 138768258816. Its totient is φ = 21200706120.

The previous prime is 66493123867. The next prime is 66493123883. The reversal of 66493123878 is 87832139466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240916978 + ... + 240917253.

It is an arithmetic number, because the mean of its divisors is an integer number (8673016176).

Almost surely, 2^66493123878 is an apocalyptic number.

66493123878 is an abundant number, since it is smaller than the sum of its proper divisors (72275134938).

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

66493123878 is a wasteful number, since it uses less digits than its factorization.

66493123878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481834259.

The product of its digits is 10450944, while the sum is 57.

The spelling of 66493123878 in words is "sixty-six billion, four hundred ninety-three million, one hundred twenty-three thousand, eight hundred seventy-eight".