215682766844164 has 27 divisors (see below), whose sum is σ = 379420620171957. Its totient is φ = 107279800038144.

The previous prime is 215682766844161. The next prime is 215682766844179. The reversal of 215682766844164 is 461448667286512.

It is a happy number.

The square root of 215682766844164 is 14686142.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 52257428944900 + 163425337899264 = 7228930^2 + 12783792^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215682766844093 and 215682766844102.

It is not an unprimeable number, because it can be changed into a prime (215682766844161) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5668831789 + ... + 5668869835.

Almost surely, 2^{215682766844164} is an apocalyptic number.

215682766844164 is the 14686142-nd square number.

It is an amenable number.

215682766844164 is a deficient number, since it is larger than the sum of its proper divisors (163737853327793).

215682766844164 is an frugal number, since it uses more digits than its factorization.

215682766844164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76484 (or 38242 counting only the distinct ones).

The product of its digits is 743178240, while the sum is 70.

The spelling of 215682766844164 in words is "two hundred fifteen trillion, six hundred eighty-two billion, seven hundred sixty-six million, eight hundred forty-four thousand, one hundred sixty-four".