66616243 has 8 divisors (see below), whose sum is σ = 68575712. Its totient is φ = 64665216.

The previous prime is 66616201. The next prime is 66616259. The reversal of 66616243 is 34261666.

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

It is a 8-Lehmer number, since φ(66616243) divides (66616243-1)⁸.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66616243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66616199 and 66616208.

It is not an unprimeable number, because it can be changed into a prime (66616843) 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, 16171 + ... + 19867.

It is an arithmetic number, because the mean of its divisors is an integer number (8571964).

Almost surely, 2^66616243 is an apocalyptic number.

66616243 is a deficient number, since it is larger than the sum of its proper divisors (1959469).

66616243 is a wasteful number, since it uses less digits than its factorization.

66616243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221.

The product of its digits is 31104, while the sum is 34.

The square root of 66616243 is about 8161.8774188296. The cubic root of 66616243 is about 405.3778782783.

The spelling of 66616243 in words is "sixty-six million, six hundred sixteen thousand, two hundred forty-three".