66120558 has 32 divisors (see below), whose sum is σ = 153394944. Its totient is φ = 18608832.

The previous prime is 66120557. The next prime is 66120563. The reversal of 66120558 is 85502166.

It is a super-3 number, since 3×66120558³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66120557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8935 + ... + 14562.

It is an arithmetic number, because the mean of its divisors is an integer number (4793592).

Almost surely, 2^66120558 is an apocalyptic number.

66120558 is an abundant number, since it is smaller than the sum of its proper divisors (87274386).

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

66120558 is a wasteful number, since it uses less digits than its factorization.

66120558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23576.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 66120558 is about 8131.4548513781. The cubic root of 66120558 is about 404.3699149243.

The spelling of 66120558 in words is "sixty-six million, one hundred twenty thousand, five hundred fifty-eight".