66810970 has 16 divisors (see below), whose sum is σ = 122819328. Its totient is φ = 26155600.

The previous prime is 66810967. The next prime is 66811001. The reversal of 66810970 is 7901866.

It is an unprimeable number.

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, 70606 + ... + 71545.

It is an arithmetic number, because the mean of its divisors is an integer number (7676208).

Almost surely, 2^66810970 is an apocalyptic number.

66810970 is a deficient number, since it is larger than the sum of its proper divisors (56008358).

66810970 is a wasteful number, since it uses less digits than its factorization.

66810970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142205.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 66810970 is about 8173.7977709263. The cubic root of 66810970 is about 405.7724828783.

The spelling of 66810970 in words is "sixty-six million, eight hundred ten thousand, nine hundred seventy".