66061606 has 8 divisors (see below), whose sum is σ = 106714944. Its totient is φ = 30489960.

The previous prime is 66061603. The next prime is 66061621. The reversal of 66061606 is 60616066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66061601) 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 3 ways as a sum of consecutive naturals, for example, 1270390 + ... + 1270441.

It is an arithmetic number, because the mean of its divisors is an integer number (13339368).

Almost surely, 2^66061606 is an apocalyptic number.

66061606 is a deficient number, since it is larger than the sum of its proper divisors (40653338).

66061606 is a wasteful number, since it uses less digits than its factorization.

66061606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540846.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66061606 is about 8127.8291074554. The cubic root of 66061606 is about 404.2497026732.

The spelling of 66061606 in words is "sixty-six million, sixty-one thousand, six hundred six".