66072558 has 8 divisors (see below), whose sum is σ = 132145128. Its totient is φ = 22024184.

The previous prime is 66072547. The next prime is 66072581. The reversal of 66072558 is 85527066.

It is a happy number.

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

66072558 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5506041 + ... + 5506052.

It is an arithmetic number, because the mean of its divisors is an integer number (16518141).

Almost surely, 2^66072558 is an apocalyptic number.

66072558 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.

66072558 is a wasteful number, since it uses less digits than its factorization.

66072558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11012098.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 66072558 is about 8128.5028141719. The cubic root of 66072558 is about 404.2720409034.

The spelling of 66072558 in words is "sixty-six million, seventy-two thousand, five hundred fifty-eight".