66605408 has 24 divisors (see below), whose sum is σ = 131439672. Its totient is φ = 33223936.

The previous prime is 66605377. The next prime is 66605449. The reversal of 66605408 is 80450666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12716 + ... + 17172.

It is an arithmetic number, because the mean of its divisors is an integer number (5476653).

Almost surely, 2^66605408 is an apocalyptic number.

It is an amenable number.

66605408 is a deficient number, since it is larger than the sum of its proper divisors (64834264).

66605408 is a wasteful number, since it uses less digits than its factorization.

66605408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4934 (or 4926 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 66605408 is about 8161.2136352383. The cubic root of 66605408 is about 405.3558991169.

The spelling of 66605408 in words is "sixty-six million, six hundred five thousand, four hundred eight".