57166261 has 2 divisors, whose sum is σ = 57166262. Its totient is φ = 57166260.

The previous prime is 57166229. The next prime is 57166267. The reversal of 57166261 is 16266175.

It is a happy number.

57166261 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., 42497361 + 14668900 = 6519^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 57166261 - 2⁵ = 57166229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57166267) 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, 28583130 + 28583131.

It is an arithmetic number, because the mean of its divisors is an integer number (28583131).

Almost surely, 2^57166261 is an apocalyptic number.

It is an amenable number.

57166261 is a deficient number, since it is larger than the sum of its proper divisors (1).

57166261 is an equidigital number, since it uses as much as digits as its factorization.

57166261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 57166261 is about 7560.8373213554. The cubic root of 57166261 is about 385.2239344901.

The spelling of 57166261 in words is "fifty-seven million, one hundred sixty-six thousand, two hundred sixty-one".