213857681543 has 8 divisors (see below), whose sum is σ = 239604675600. Its totient is φ = 189161585280.

The previous prime is 213857681537. The next prime is 213857681549. The reversal of 213857681543 is 345186758312.

It is an interprime number because it is at equal distance from previous prime (213857681537) and next prime (213857681549).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213857681543 - 2¹⁴ = 213857665159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213857681549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262724018 + ... + 262724831.

It is an arithmetic number, because the mean of its divisors is an integer number (29950584450).

Almost surely, 2^213857681543 is an apocalyptic number.

213857681543 is a deficient number, since it is larger than the sum of its proper divisors (25746994057).

213857681543 is a wasteful number, since it uses less digits than its factorization.

213857681543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525448897.

The product of its digits is 4838400, while the sum is 53.

The spelling of 213857681543 in words is "two hundred thirteen billion, eight hundred fifty-seven million, six hundred eighty-one thousand, five hundred forty-three".