366656221 has 4 divisors (see below), whose sum is σ = 388224252. Its totient is φ = 345088192.

The previous prime is 366656219. The next prime is 366656231. The reversal of 366656221 is 122656663.

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 314672121 + 51984100 = 17739^2 + 7210^2 .

It is a cyclic number.

It is not a de Polignac number, because 366656221 - 2¹ = 366656219 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 (366656201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10783990 + ... + 10784023.

It is an arithmetic number, because the mean of its divisors is an integer number (97056063).

Almost surely, 2^366656221 is an apocalyptic number.

It is an amenable number.

366656221 is a deficient number, since it is larger than the sum of its proper divisors (21568031).

366656221 is a wasteful number, since it uses less digits than its factorization.

366656221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21568030.

The product of its digits is 77760, while the sum is 37.

The square root of 366656221 is about 19148.2693996089. The cubic root of 366656221 is about 715.7362595357.

The spelling of 366656221 in words is "three hundred sixty-six million, six hundred fifty-six thousand, two hundred twenty-one".