66243155 has 8 divisors (see below), whose sum is σ = 86718384. Its totient is φ = 48176800.

The previous prime is 66243137. The next prime is 66243157. The reversal of 66243155 is 55134266.

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

It is a de Polignac number, because none of the positive numbers 2^k-66243155 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66243157) 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, 602156 + ... + 602265.

It is an arithmetic number, because the mean of its divisors is an integer number (10839798).

Almost surely, 2^66243155 is an apocalyptic number.

66243155 is a deficient number, since it is larger than the sum of its proper divisors (20475229).

66243155 is a wasteful number, since it uses less digits than its factorization.

66243155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204437.

The product of its digits is 21600, while the sum is 32.

The square root of 66243155 is about 8138.9898021806. The cubic root of 66243155 is about 404.6196805648.

Subtracting from 66243155 its reverse (55134266), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 6624 and 3155, that added together give a palindrome (9779).

The spelling of 66243155 in words is "sixty-six million, two hundred forty-three thousand, one hundred fifty-five".