66555059 has 4 divisors (see below), whose sum is σ = 66729216. Its totient is φ = 66380904.

The previous prime is 66555023. The next prime is 66555089. The reversal of 66555059 is 95055566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95055566 = 2 ⋅47527783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66555059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66555089) 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, 86504 + ... + 87269.

It is an arithmetic number, because the mean of its divisors is an integer number (16682304).

Almost surely, 2^66555059 is an apocalyptic number.

66555059 is a deficient number, since it is larger than the sum of its proper divisors (174157).

66555059 is a wasteful number, since it uses less digits than its factorization.

66555059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174156.

The product of its (nonzero) digits is 202500, while the sum is 41.

The square root of 66555059 is about 8158.1284005585. The cubic root of 66555059 is about 405.2537331938.

The spelling of 66555059 in words is "sixty-six million, five hundred fifty-five thousand, fifty-nine".