66610605 has 8 divisors (see below), whose sum is σ = 106576992. Its totient is φ = 35525648.

The previous prime is 66610589. The next prime is 66610613. The reversal of 66610605 is 50601666.

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

It is a cyclic number.

It is not a de Polignac number, because 66610605 - 2⁴ = 66610589 is a prime.

It is a congruent number.

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, 2220339 + ... + 2220368.

It is an arithmetic number, because the mean of its divisors is an integer number (13322124).

Almost surely, 2^66610605 is an apocalyptic number.

It is an amenable number.

66610605 is a deficient number, since it is larger than the sum of its proper divisors (39966387).

66610605 is a wasteful number, since it uses less digits than its factorization.

66610605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440715.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 66610605 is about 8161.5320253002. The cubic root of 66610605 is about 405.3664417033.

The spelling of 66610605 in words is "sixty-six million, six hundred ten thousand, six hundred five".