66158378 has 16 divisors (see below), whose sum is σ = 116587296. Its totient is φ = 27758640.

The previous prime is 66158377. The next prime is 66158383. The reversal of 66158378 is 87385166.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66158377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115376 + ... + 115947.

It is an arithmetic number, because the mean of its divisors is an integer number (7286706).

Almost surely, 2^66158378 is an apocalyptic number.

66158378 is a deficient number, since it is larger than the sum of its proper divisors (50428918).

66158378 is a wasteful number, since it uses less digits than its factorization.

66158378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231349.

The product of its digits is 241920, while the sum is 44.

The square root of 66158378 is about 8133.7800560379. The cubic root of 66158378 is about 404.4469981378.

The spelling of 66158378 in words is "sixty-six million, one hundred fifty-eight thousand, three hundred seventy-eight".