68143447849 has 3 divisors (see below), whose sum is σ = 68143708893. Its totient is φ = 68143186806.

The previous prime is 68143447829. The next prime is 68143447877. The reversal of 68143447849 is 94874434186.

It is a happy number.

The square root of 68143447849 is 261043.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 68143447849 - 2⁵ = 68143447817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68143447793 and 68143447802.

It is not an unprimeable number, because it can be changed into a prime (68143447829) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 130522 + ... + 391564.

It is an arithmetic number, because the mean of its divisors is an integer number (22714569631).

Almost surely, 2^68143447849 is an apocalyptic number.

68143447849 is the 261043-rd square number.

68143447849 is the 130522-nd centered octagonal number.

It is an amenable number.

68143447849 is a deficient number, since it is larger than the sum of its proper divisors (261044).

68143447849 is an frugal number, since it uses more digits than its factorization.

68143447849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522086 (or 261043 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 58.

The spelling of 68143447849 in words is "sixty-eight billion, one hundred forty-three million, four hundred forty-seven thousand, eight hundred forty-nine".