366512404221 has 6 divisors (see below), whose sum is σ = 529406806110. Its totient is φ = 244341602808.

The previous prime is 366512404207. The next prime is 366512404277. The reversal of 366512404221 is 122404215663.

366512404221 is a `hidden beast` number, since 3 + 66 + 512 + 40 + 42 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 244173351321 + 122339052900 = 494139^2 + 349770^2 .

It is not a de Polignac number, because 366512404221 - 2¹⁸ = 366512142077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (366512404721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20361800226 + ... + 20361800243.

It is an arithmetic number, because the mean of its divisors is an integer number (88234467685).

Almost surely, 2^366512404221 is an apocalyptic number.

It is an amenable number.

366512404221 is a deficient number, since it is larger than the sum of its proper divisors (162894401889).

366512404221 is a wasteful number, since it uses less digits than its factorization.

366512404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40723600475 (or 40723600472 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 366512404221 its reverse (122404215663), we get a palindrome (488916619884).

The spelling of 366512404221 in words is "three hundred sixty-six billion, five hundred twelve million, four hundred four thousand, two hundred twenty-one".