66078123 has 4 divisors (see below), whose sum is σ = 88104168. Its totient is φ = 44052080.

The previous prime is 66078119. The next prime is 66078137. The reversal of 66078123 is 32187066.

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 66078123 - 2² = 66078119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66078113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11013018 + ... + 11013023.

It is an arithmetic number, because the mean of its divisors is an integer number (22026042).

Almost surely, 2^66078123 is an apocalyptic number.

66078123 is a deficient number, since it is larger than the sum of its proper divisors (22026045).

66078123 is a wasteful number, since it uses less digits than its factorization.

66078123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22026044.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 66078123 is about 8128.8451209259. The cubic root of 66078123 is about 404.2833906015.

The spelling of 66078123 in words is "sixty-six million, seventy-eight thousand, one hundred twenty-three".