57721663 has 2 divisors, whose sum is σ = 57721664. Its totient is φ = 57721662.

The previous prime is 57721661. The next prime is 57721673. The reversal of 57721663 is 36612775.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57721663 - 2¹ = 57721661 is a prime.

Together with 57721661, 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 (57721661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28860831 + 28860832.

It is an arithmetic number, because the mean of its divisors is an integer number (28860832).

Almost surely, 2^57721663 is an apocalyptic number.

57721663 is a deficient number, since it is larger than the sum of its proper divisors (1).

57721663 is an equidigital number, since it uses as much as digits as its factorization.

57721663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 37.

The square root of 57721663 is about 7597.4774102988. The cubic root of 57721663 is about 386.4674708075.

The spelling of 57721663 in words is "fifty-seven million, seven hundred twenty-one thousand, six hundred sixty-three".