57781333849 has 2 divisors, whose sum is σ = 57781333850. Its totient is φ = 57781333848.

The previous prime is 57781333843. The next prime is 57781333871. The reversal of 57781333849 is 94833318775.

It is a happy number.

57781333849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37112096025 + 20669237824 = 192645^2 + 143768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57781333849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 57781333793 and 57781333802.

It is not a weakly prime, because it can be changed into another prime (57781333843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28890666924 + 28890666925.

It is an arithmetic number, because the mean of its divisors is an integer number (28890666925).

Almost surely, 2^57781333849 is an apocalyptic number.

It is an amenable number.

57781333849 is a deficient number, since it is larger than the sum of its proper divisors (1).

57781333849 is an equidigital number, since it uses as much as digits as its factorization.

57781333849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 58.

The spelling of 57781333849 in words is "fifty-seven billion, seven hundred eighty-one million, three hundred thirty-three thousand, eight hundred forty-nine".