68213634943 has 4 divisors (see below), whose sum is σ = 68215106440. Its totient is φ = 68212163448.

The previous prime is 68213634941. The next prime is 68213634953. The reversal of 68213634943 is 34943631286.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68213634943 - 2¹ = 68213634941 is a prime.

It is a super-2 number, since 2×68213634943² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68213634941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663873 + ... + 759706.

It is an arithmetic number, because the mean of its divisors is an integer number (17053776610).

Almost surely, 2^68213634943 is an apocalyptic number.

68213634943 is a deficient number, since it is larger than the sum of its proper divisors (1471497).

68213634943 is a wasteful number, since it uses less digits than its factorization.

68213634943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471496.

The product of its digits is 2239488, while the sum is 49.

The spelling of 68213634943 in words is "sixty-eight billion, two hundred thirteen million, six hundred thirty-four thousand, nine hundred forty-three".