53666381 has 2 divisors, whose sum is σ = 53666382. Its totient is φ = 53666380.

The previous prime is 53666357. The next prime is 53666387. The reversal of 53666381 is 18366635.

53666381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37393225 + 16273156 = 6115^2 + 4034^2 .

It is a cyclic number.

It is not a de Polignac number, because 53666381 - 2¹⁴ = 53649997 is a prime.

It is a super-2 number, since 2×53666381² = 5760160899274322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53666387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26833190 + 26833191.

It is an arithmetic number, because the mean of its divisors is an integer number (26833191).

Almost surely, 2^53666381 is an apocalyptic number.

It is an amenable number.

53666381 is a deficient number, since it is larger than the sum of its proper divisors (1).

53666381 is an equidigital number, since it uses as much as digits as its factorization.

53666381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 53666381 is about 7325.7341611609. The cubic root of 53666381 is about 377.1963108772.

The spelling of 53666381 in words is "fifty-three million, six hundred sixty-six thousand, three hundred eighty-one".