66078147 has 16 divisors (see below), whose sum is σ = 89731712. Its totient is φ = 43243200.

The previous prime is 66078137. The next prime is 66078151. The reversal of 66078147 is 74187066.

66078147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66078147 - 2⁶ = 66078083 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66078137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109647 + ... + 110247.

It is an arithmetic number, because the mean of its divisors is an integer number (5608232).

Almost surely, 2^66078147 is an apocalyptic number.

66078147 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

66078147 is a deficient number, since it is larger than the sum of its proper divisors (23653565).

66078147 is a wasteful number, since it uses less digits than its factorization.

66078147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 66078147 is about 8128.8465971502. The cubic root of 66078147 is about 404.2834395476.

The spelling of 66078147 in words is "sixty-six million, seventy-eight thousand, one hundred forty-seven".