66606606 has 24 divisors (see below), whose sum is σ = 157434264. Its totient is φ = 20183760.

The previous prime is 66606601. The next prime is 66606611. The reversal of 66606606 is 60660666.

It is an interprime number because it is at equal distance from previous prime (66606601) and next prime (66606611).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66606601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168001 + ... + 168396.

It is an arithmetic number, because the mean of its divisors is an integer number (6559761).

Almost surely, 2^66606606 is an apocalyptic number.

66606606 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66606606 is an abundant number, since it is smaller than the sum of its proper divisors (90827658).

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

66606606 is a wasteful number, since it uses less digits than its factorization.

66606606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336416 (or 336413 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 66606606 is about 8161.2870308549. The cubic root of 66606606 is about 405.3583294173.

It can be divided in two parts, 6660660 and 6, that added together give a palindrome (6660666).

The spelling of 66606606 in words is "sixty-six million, six hundred six thousand, six hundred six".