66554505 has 24 divisors (see below), whose sum is σ = 115644672. Its totient is φ = 35408544.

The previous prime is 66554503. The next prime is 66554557. The reversal of 66554505 is 50545566.

It is a happy number.

It is not a de Polignac number, because 66554505 - 2¹ = 66554503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66554505.

It is not an unprimeable number, because it can be changed into a prime (66554503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19432 + ... + 22598.

It is an arithmetic number, because the mean of its divisors is an integer number (4818528).

Almost surely, 2^66554505 is an apocalyptic number.

It is an amenable number.

66554505 is a deficient number, since it is larger than the sum of its proper divisors (49090167).

66554505 is a wasteful number, since it uses less digits than its factorization.

66554505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645 (or 3642 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 66554505 is about 8158.0944466217. The cubic root of 66554505 is about 405.2526087554.

The spelling of 66554505 in words is "sixty-six million, five hundred fifty-four thousand, five hundred five".