66565155 has 8 divisors (see below), whose sum is σ = 106504272. Its totient is φ = 35501408.

The previous prime is 66565141. The next prime is 66565171. The reversal of 66565155 is 55156566.

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

It is a cyclic number.

It is not a de Polignac number, because 66565155 - 2⁴ = 66565139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2218824 + ... + 2218853.

It is an arithmetic number, because the mean of its divisors is an integer number (13313034).

Almost surely, 2^66565155 is an apocalyptic number.

66565155 is a deficient number, since it is larger than the sum of its proper divisors (39939117).

66565155 is a wasteful number, since it uses less digits than its factorization.

66565155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437685.

The product of its digits is 135000, while the sum is 39.

The square root of 66565155 is about 8158.7471464680. The cubic root of 66565155 is about 405.2742236713.

It can be divided in two parts, 6656 and 5155, that added together give a palindrome (11811).

The spelling of 66565155 in words is "sixty-six million, five hundred sixty-five thousand, one hundred fifty-five".