57938781681 has 20 divisors (see below), whose sum is σ = 94418756784. Its totient is φ = 35114412600.

The previous prime is 57938781679. The next prime is 57938781689. The reversal of 57938781681 is 18618783975.

It is not a de Polignac number, because 57938781681 - 2¹ = 57938781679 is a prime.

It is a super-2 number, since 2×57938781681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (57938781689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32512455 + ... + 32514236.

Almost surely, 2^57938781681 is an apocalyptic number.

It is an amenable number.

57938781681 is a deficient number, since it is larger than the sum of its proper divisors (36479975103).

57938781681 is a wasteful number, since it uses less digits than its factorization.

57938781681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65026714 (or 65026705 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 57938781681 in words is "fifty-seven billion, nine hundred thirty-eight million, seven hundred eighty-one thousand, six hundred eighty-one".