66216541 has 8 divisors (see below), whose sum is σ = 68591520. Its totient is φ = 63847728.

The previous prime is 66216511. The next prime is 66216551. The reversal of 66216541 is 14561266.

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 66216541 - 2⁷ = 66216413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66216511) 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, 37030 + ... + 38776.

It is an arithmetic number, because the mean of its divisors is an integer number (8573940).

Almost surely, 2^66216541 is an apocalyptic number.

It is an amenable number.

66216541 is a deficient number, since it is larger than the sum of its proper divisors (2374979).

66216541 is a wasteful number, since it uses less digits than its factorization.

66216541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3083.

The product of its digits is 8640, while the sum is 31.

The square root of 66216541 is about 8137.3546684411. The cubic root of 66216541 is about 404.5654863333.

The spelling of 66216541 in words is "sixty-six million, two hundred sixteen thousand, five hundred forty-one".