66606090 has 16 divisors (see below), whose sum is σ = 159854688. Its totient is φ = 17761616.

The previous prime is 66606061. The next prime is 66606121. The reversal of 66606090 is 9060666.

It is a Curzon 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, 1110072 + ... + 1110131.

It is an arithmetic number, because the mean of its divisors is an integer number (9990918).

Almost surely, 2^66606090 is an apocalyptic number.

66606090 is an abundant number, since it is smaller than the sum of its proper divisors (93248598).

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

66606090 is a wasteful number, since it uses less digits than its factorization.

66606090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220213.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 66606090 is about 8161.2554181327. The cubic root of 66606090 is about 405.3572826471.

The spelling of 66606090 in words is "sixty-six million, six hundred six thousand, ninety".