3923543857681 has 32 divisors (see below), whose sum is σ = 4731409013760. Its totient is φ = 3178373846976.

The previous prime is 3923543857679. The next prime is 3923543857711. The reversal of 3923543857681 is 1867583453293.

It is a happy number.

3923543857681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3923543857681 - 2¹ = 3923543857679 is a prime.

It is a super-2 number, since 2×3923543857681² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3923543857601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361045810 + ... + 361056676.

It is an arithmetic number, because the mean of its divisors is an integer number (147856531680).

Almost surely, 2^{3923543857681} is an apocalyptic number.

It is an amenable number.

3923543857681 is a deficient number, since it is larger than the sum of its proper divisors (807865156079).

3923543857681 is a wasteful number, since it uses less digits than its factorization.

3923543857681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17173.

The product of its digits is 130636800, while the sum is 64.

The spelling of 3923543857681 in words is "three trillion, nine hundred twenty-three billion, five hundred forty-three million, eight hundred fifty-seven thousand, six hundred eighty-one".