82218661 has 8 divisors (see below), whose sum is σ = 94074624. Its totient is φ = 70390320.

The previous prime is 82218649. The next prime is 82218671. The reversal of 82218661 is 16681228.

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

It is not a de Polignac number, because 82218661 - 2⁷ = 82218533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82218601) 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, 70 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (11759328).

Almost surely, 2^82218661 is an apocalyptic number.

It is an amenable number.

82218661 is a deficient number, since it is larger than the sum of its proper divisors (11855963).

82218661 is a wasteful number, since it uses less digits than its factorization.

82218661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13811.

The product of its digits is 9216, while the sum is 34.

The square root of 82218661 is about 9067.4506339985. The cubic root of 82218661 is about 434.8339719590.

Adding to 82218661 its reverse (16681228), we get a palindrome (98899889).

The spelling of 82218661 in words is "eighty-two million, two hundred eighteen thousand, six hundred sixty-one".