66706670 has 64 divisors (see below), whose sum is σ = 132347520. Its totient is φ = 24127488.

The previous prime is 66706667. The next prime is 66706687. The reversal of 66706670 is 7660766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 486842 + ... + 486978.

It is an arithmetic number, because the mean of its divisors is an integer number (2067930).

Almost surely, 2^66706670 is an apocalyptic number.

66706670 is a deficient number, since it is larger than the sum of its proper divisors (65640850).

66706670 is a wasteful number, since it uses less digits than its factorization.

66706670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 66706670 is about 8167.4151357697. The cubic root of 66706670 is about 405.5612196063.

It can be divided in two parts, 66706 and 670, that added together give a palindrome (67376).

The spelling of 66706670 in words is "sixty-six million, seven hundred six thousand, six hundred seventy".