57821663 has 2 divisors, whose sum is σ = 57821664. Its totient is φ = 57821662.

The previous prime is 57821653. The next prime is 57821671. The reversal of 57821663 is 36612875.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57821663 - 2¹⁰ = 57820639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57821653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28910831 + 28910832.

It is an arithmetic number, because the mean of its divisors is an integer number (28910832).

Almost surely, 2^57821663 is an apocalyptic number.

57821663 is a deficient number, since it is larger than the sum of its proper divisors (1).

57821663 is an equidigital number, since it uses as much as digits as its factorization.

57821663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 57821663 is about 7604.0556941674. The cubic root of 57821663 is about 386.6905208067.

The spelling of 57821663 in words is "fifty-seven million, eight hundred twenty-one thousand, six hundred sixty-three".