57729389981 has 2 divisors, whose sum is σ = 57729389982. Its totient is φ = 57729389980.

The previous prime is 57729389957. The next prime is 57729389999. The reversal of 57729389981 is 18998392775.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52930364356 + 4799025625 = 230066^2 + 69275^2 .

It is a cyclic number.

It is not a de Polignac number, because 57729389981 - 2¹⁸ = 57729127837 is a prime.

It is a super-2 number, since 2×57729389981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57729389381) 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, 28864694990 + 28864694991.

It is an arithmetic number, because the mean of its divisors is an integer number (28864694991).

Almost surely, 2^57729389981 is an apocalyptic number.

It is an amenable number.

57729389981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57729389981 is an equidigital number, since it uses as much as digits as its factorization.

57729389981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68584320, while the sum is 68.

The spelling of 57729389981 in words is "fifty-seven billion, seven hundred twenty-nine million, three hundred eighty-nine thousand, nine hundred eighty-one".