66934368778 has 32 divisors (see below), whose sum is σ = 106710456960. Its totient is φ = 31428129600.

The previous prime is 66934368769. The next prime is 66934368791. The reversal of 66934368778 is 87786343966.

66934368778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9101803 + ... + 9109153.

It is an arithmetic number, because the mean of its divisors is an integer number (3334701780).

Almost surely, 2^66934368778 is an apocalyptic number.

66934368778 is a deficient number, since it is larger than the sum of its proper divisors (39776088182).

66934368778 is a wasteful number, since it uses less digits than its factorization.

66934368778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11662.

The product of its digits is 219469824, while the sum is 67.

The spelling of 66934368778 in words is "sixty-six billion, nine hundred thirty-four million, three hundred sixty-eight thousand, seven hundred seventy-eight".