66069378 has 32 divisors (see below), whose sum is σ = 155459520. Its totient is φ = 20727360.

The previous prime is 66069347. The next prime is 66069379. The reversal of 66069378 is 87396066.

66069378 is a `hidden beast` number, since 6 + 606 + 9 + 37 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66069379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35068 + ... + 36903.

It is an arithmetic number, because the mean of its divisors is an integer number (4858110).

Almost surely, 2^66069378 is an apocalyptic number.

66069378 is an abundant number, since it is smaller than the sum of its proper divisors (89390142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66069378 is a wasteful number, since it uses less digits than its factorization.

66069378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71999 (or 71993 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66069378 is about 8128.3072038402. The cubic root of 66069378 is about 404.2655550756.

The spelling of 66069378 in words is "sixty-six million, sixty-nine thousand, three hundred seventy-eight".