66554525 has 24 divisors (see below), whose sum is σ = 86631360. Its totient is φ = 50624640.

The previous prime is 66554503. The next prime is 66554557. The reversal of 66554525 is 52545566.

It is a happy number.

It is not a de Polignac number, because 66554525 - 2¹⁴ = 66538141 is a prime.

Its product of digits (180000) is a multiple of the sum of its prime divisors (720).

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 162521 + ... + 162929.

It is an arithmetic number, because the mean of its divisors is an integer number (3609640).

Almost surely, 2^66554525 is an apocalyptic number.

It is an amenable number.

66554525 is a deficient number, since it is larger than the sum of its proper divisors (20076835).

66554525 is a wasteful number, since it uses less digits than its factorization.

66554525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 720 counting only the distinct ones).

The product of its digits is 180000, while the sum is 38.

The square root of 66554525 is about 8158.0956723981. The cubic root of 66554525 is about 405.2526493489.

The spelling of 66554525 in words is "sixty-six million, five hundred fifty-four thousand, five hundred twenty-five".