66689413378 has 16 divisors (see below), whose sum is σ = 117113117184. Its totient is φ = 27884075040.

The previous prime is 66689413363. The next prime is 66689413387. The reversal of 66689413378 is 87331498666.

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, 58091250 + ... + 58092397.

It is an arithmetic number, because the mean of its divisors is an integer number (7319569824).

Almost surely, 2^66689413378 is an apocalyptic number.

66689413378 is a deficient number, since it is larger than the sum of its proper divisors (50423703806).

66689413378 is a wasteful number, since it uses less digits than its factorization.

66689413378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116183697.

The product of its digits is 31352832, while the sum is 61.

The spelling of 66689413378 in words is "sixty-six billion, six hundred eighty-nine million, four hundred thirteen thousand, three hundred seventy-eight".