66767678077 has 8 divisors (see below), whose sum is σ = 69222448640. Its totient is φ = 64331718480.

The previous prime is 66767678069. The next prime is 66767678129. The reversal of 66767678077 is 77087676766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66767678077 - 2³ = 66767678069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66767678017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4695513 + ... + 4709710.

It is an arithmetic number, because the mean of its divisors is an integer number (8652806080).

Almost surely, 2^66767678077 is an apocalyptic number.

It is an amenable number.

66767678077 is a deficient number, since it is larger than the sum of its proper divisors (2454770563).

66767678077 is a wasteful number, since it uses less digits than its factorization.

66767678077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9405483.

The product of its (nonzero) digits is 174254976, while the sum is 67.

The spelling of 66767678077 in words is "sixty-six billion, seven hundred sixty-seven million, six hundred seventy-eight thousand, seventy-seven".