66330554 has 4 divisors (see below), whose sum is σ = 99495834. Its totient is φ = 33165276.

The previous prime is 66330547. The next prime is 66330557. The reversal of 66330554 is 45503366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42055225 + 24275329 = 6485^2 + 4927^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66330554.

It is not an unprimeable number, because it can be changed into a prime (66330557) 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 as a sum of consecutive naturals, namely, 16582637 + ... + 16582640.

Almost surely, 2^66330554 is an apocalyptic number.

66330554 is a deficient number, since it is larger than the sum of its proper divisors (33165280).

66330554 is a wasteful number, since it uses less digits than its factorization.

66330554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33165279.

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 66330554 is about 8144.3571876484. The cubic root of 66330554 is about 404.7975495811.

The spelling of 66330554 in words is "sixty-six million, three hundred thirty thousand, five hundred fifty-four".