66855597 has 8 divisors (see below), whose sum is σ = 89192160. Its totient is φ = 44544720.

The previous prime is 66855563. The next prime is 66855599. The reversal of 66855597 is 79555866.

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

It is not a de Polignac number, because 66855597 - 2⁶ = 66855533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66855599) 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, 822 + ... + 11592.

It is an arithmetic number, because the mean of its divisors is an integer number (11149020).

Almost surely, 2^66855597 is an apocalyptic number.

It is an amenable number.

66855597 is a deficient number, since it is larger than the sum of its proper divisors (22336563).

66855597 is a wasteful number, since it uses less digits than its factorization.

66855597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12843.

The product of its digits is 2268000, while the sum is 51.

The square root of 66855597 is about 8176.5271967994. The cubic root of 66855597 is about 405.8628092533.

It can be divided in two parts, 668 and 55597, that added together give a palindrome (56265).

The spelling of 66855597 in words is "sixty-six million, eight hundred fifty-five thousand, five hundred ninety-seven".