57661693 has 2 divisors, whose sum is σ = 57661694. Its totient is φ = 57661692.

The previous prime is 57661691. The next prime is 57661699. The reversal of 57661693 is 39616675.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57350329 + 311364 = 7573^2 + 558^2 .

It is a cyclic number.

It is not a de Polignac number, because 57661693 - 2¹ = 57661691 is a prime.

Together with 57661691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57661691) 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 as a sum of consecutive naturals, namely, 28830846 + 28830847.

It is an arithmetic number, because the mean of its divisors is an integer number (28830847).

Almost surely, 2^57661693 is an apocalyptic number.

It is an amenable number.

57661693 is a deficient number, since it is larger than the sum of its proper divisors (1).

57661693 is an equidigital number, since it uses as much as digits as its factorization.

57661693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 57661693 is about 7593.5296799315. The cubic root of 57661693 is about 386.3335841287. Note that the first 3 decimals are identical.

The spelling of 57661693 in words is "fifty-seven million, six hundred sixty-one thousand, six hundred ninety-three".