66143378 has 16 divisors (see below), whose sum is σ = 114284544. Its totient is φ = 28123200.

The previous prime is 66143359. The next prime is 66143381. The reversal of 66143378 is 87334166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16823 + ... + 20378.

It is an arithmetic number, because the mean of its divisors is an integer number (7142784).

Almost surely, 2^66143378 is an apocalyptic number.

66143378 is a deficient number, since it is larger than the sum of its proper divisors (48141166).

66143378 is a wasteful number, since it uses less digits than its factorization.

66143378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37337.

The product of its digits is 72576, while the sum is 38.

The square root of 66143378 is about 8132.8579232641. The cubic root of 66143378 is about 404.4164292529.

The spelling of 66143378 in words is "sixty-six million, one hundred forty-three thousand, three hundred seventy-eight".