66606605 has 16 divisors (see below), whose sum is σ = 86292864. Its totient is φ = 49062720.

The previous prime is 66606601. The next prime is 66606611. The reversal of 66606605 is 50660666.

It is not a de Polignac number, because 66606605 - 2² = 66606601 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 30872 + ... + 32958.

It is an arithmetic number, because the mean of its divisors is an integer number (5393304).

Almost surely, 2^66606605 is an apocalyptic number.

66606605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66606605 is a deficient number, since it is larger than the sum of its proper divisors (19686259).

66606605 is a wasteful number, since it uses less digits than its factorization.

66606605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 66606605 is about 8161.2869695900. The cubic root of 66606605 is about 405.3583273887.

The spelling of 66606605 in words is "sixty-six million, six hundred six thousand, six hundred five".