66581058 has 8 divisors (see below), whose sum is σ = 133162128. Its totient is φ = 22193684.

The previous prime is 66581051. The next prime is 66581059. The reversal of 66581058 is 85018566.

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

66581058 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (66581051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5548416 + ... + 5548427.

It is an arithmetic number, because the mean of its divisors is an integer number (16645266).

Almost surely, 2^66581058 is an apocalyptic number.

66581058 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66581058 is a wasteful number, since it uses less digits than its factorization.

66581058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11096848.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 66581058 is about 8159.7216864302. The cubic root of 66581058 is about 405.3064956249.

The spelling of 66581058 in words is "sixty-six million, five hundred eighty-one thousand, fifty-eight".