66554984 has 8 divisors (see below), whose sum is σ = 124790610. Its totient is φ = 33277488.

The previous prime is 66554981. The next prime is 66554987. The reversal of 66554984 is 48945566.

It is an interprime number because it is at equal distance from previous prime (66554981) and next prime (66554987).

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 13118884 = 7310^2 + 3622^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (66554981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4159679 + ... + 4159694.

Almost surely, 2^66554984 is an apocalyptic number.

It is an amenable number.

66554984 is a deficient number, since it is larger than the sum of its proper divisors (58235626).

66554984 is a wasteful number, since it uses less digits than its factorization.

66554984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319379 (or 8319375 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The square root of 66554984 is about 8158.1238039147. The cubic root of 66554984 is about 405.2535809687.

The spelling of 66554984 in words is "sixty-six million, five hundred fifty-four thousand, nine hundred eighty-four".