366660647321 has 4 divisors (see below), whose sum is σ = 367222149732. Its totient is φ = 366099144912.

The previous prime is 366660647317. The next prime is 366660647347. The reversal of 366660647321 is 123746066663.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130526851225 + 236133796096 = 361285^2 + 485936^2 .

It is a cyclic number.

It is not a de Polignac number, because 366660647321 - 2² = 366660647317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 366660647321.

It is not an unprimeable number, because it can be changed into a prime (366660647921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280750226 + ... + 280751531.

It is an arithmetic number, because the mean of its divisors is an integer number (91805537433).

Almost surely, 2^366660647321 is an apocalyptic number.

It is an amenable number.

366660647321 is a deficient number, since it is larger than the sum of its proper divisors (561502411).

366660647321 is an equidigital number, since it uses as much as digits as its factorization.

366660647321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561502410.

The product of its (nonzero) digits is 3919104, while the sum is 50.

The spelling of 366660647321 in words is "three hundred sixty-six billion, six hundred sixty million, six hundred forty-seven thousand, three hundred twenty-one".