66555105 has 8 divisors (see below), whose sum is σ = 106488192. Its totient is φ = 35496048.

The previous prime is 66555103. The next prime is 66555107. The reversal of 66555105 is 50155566.

It is an interprime number because it is at equal distance from previous prime (66555103) and next prime (66555107).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66555105 - 2¹ = 66555103 is a prime.

It is a super-2 number, since 2×66555105² = 8859164003122050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66555103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2218489 + ... + 2218518.

It is an arithmetic number, because the mean of its divisors is an integer number (13311024).

Almost surely, 2^66555105 is an apocalyptic number.

It is an amenable number.

66555105 is a deficient number, since it is larger than the sum of its proper divisors (39933087).

66555105 is a wasteful number, since it uses less digits than its factorization.

66555105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437015.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 66555105 is about 8158.1312198321. The cubic root of 66555105 is about 405.2538265584.

The spelling of 66555105 in words is "sixty-six million, five hundred fifty-five thousand, one hundred five".