57866667821 has 2 divisors, whose sum is σ = 57866667822. Its totient is φ = 57866667820.

The previous prime is 57866667809. The next prime is 57866667847. The reversal of 57866667821 is 12876666875.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29786962921 + 28079704900 = 172589^2 + 167570^2 .

It is a cyclic number.

It is not a de Polignac number, because 57866667821 - 2¹⁸ = 57866405677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57866660821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28933333910 + 28933333911.

It is an arithmetic number, because the mean of its divisors is an integer number (28933333911).

Almost surely, 2^57866667821 is an apocalyptic number.

It is an amenable number.

57866667821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57866667821 is an equidigital number, since it uses as much as digits as its factorization.

57866667821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 62.

The spelling of 57866667821 in words is "fifty-seven billion, eight hundred sixty-six million, six hundred sixty-seven thousand, eight hundred twenty-one".