66555004 has 6 divisors (see below), whose sum is σ = 116471264. Its totient is φ = 33277500.

The previous prime is 66554987. The next prime is 66555023. The reversal of 66555004 is 40055566.

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 as a sum of consecutive naturals, namely, 8319372 + ... + 8319379.

Almost surely, 2^66555004 is an apocalyptic number.

It is an amenable number.

66555004 is a deficient number, since it is larger than the sum of its proper divisors (49916260).

66555004 is a wasteful number, since it uses less digits than its factorization.

66555004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16638755 (or 16638753 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 66555004 is about 8158.1250296867. The cubic root of 66555004 is about 405.2536215621.

The spelling of 66555004 in words is "sixty-six million, five hundred fifty-five thousand, four".