66554549 has 4 divisors (see below), whose sum is σ = 70057440. Its totient is φ = 63051660.

The previous prime is 66554503. The next prime is 66554557. The reversal of 66554549 is 94545566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66554549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554149) 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 3 ways as a sum of consecutive naturals, for example, 1751417 + ... + 1751454.

It is an arithmetic number, because the mean of its divisors is an integer number (17514360).

Almost surely, 2^66554549 is an apocalyptic number.

It is an amenable number.

66554549 is a deficient number, since it is larger than the sum of its proper divisors (3502891).

66554549 is a wasteful number, since it uses less digits than its factorization.

66554549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502890.

The product of its digits is 648000, while the sum is 44.

The square root of 66554549 is about 8158.0971433294. The cubic root of 66554549 is about 405.2526980612.

The spelling of 66554549 in words is "sixty-six million, five hundred fifty-four thousand, five hundred forty-nine".