66878157167 has 4 divisors (see below), whose sum is σ = 66882590496. Its totient is φ = 66873723840.

The previous prime is 66878157077. The next prime is 66878157197. The reversal of 66878157167 is 76175187866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66878157167 - 2³² = 62583189871 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 (66878157197) 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 3 ways as a sum of consecutive naturals, for example, 2193959 + ... + 2224232.

It is an arithmetic number, because the mean of its divisors is an integer number (16720647624).

Almost surely, 2^66878157167 is an apocalyptic number.

66878157167 is a deficient number, since it is larger than the sum of its proper divisors (4433329).

66878157167 is a wasteful number, since it uses less digits than its factorization.

66878157167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433328.

The product of its digits is 23708160, while the sum is 62.

The spelling of 66878157167 in words is "sixty-six billion, eight hundred seventy-eight million, one hundred fifty-seven thousand, one hundred sixty-seven".