366665381 has 2 divisors, whose sum is σ = 366665382. Its totient is φ = 366665380.

The previous prime is 366665359. The next prime is 366665393. The reversal of 366665381 is 183566663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 345588100 + 21077281 = 18590^2 + 4591^2 .

It is a cyclic number.

It is not a de Polignac number, because 366665381 - 2⁶ = 366665317 is a prime.

It is a super-3 number, since 3×366665381³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366665311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 183332690 + 183332691.

It is an arithmetic number, because the mean of its divisors is an integer number (183332691).

Almost surely, 2^366665381 is an apocalyptic number.

It is an amenable number.

366665381 is a deficient number, since it is larger than the sum of its proper divisors (1).

366665381 is an equidigital number, since it uses as much as digits as its factorization.

366665381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 366665381 is about 19148.5085842214. The cubic root of 366665381 is about 715.7422197869.

The spelling of 366665381 in words is "three hundred sixty-six million, six hundred sixty-five thousand, three hundred eighty-one".