77143232321 has 4 divisors (see below), whose sum is σ = 77188692612. Its totient is φ = 77097772032.

The previous prime is 77143232273. The next prime is 77143232389. The reversal of 77143232321 is 12323234177.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31362639025 + 45780593296 = 177095^2 + 213964^2 .

It is a cyclic number.

It is not a de Polignac number, because 77143232321 - 2³⁴ = 59963363137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77143232521) 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 3 ways as a sum of consecutive naturals, for example, 22727600 + ... + 22730993.

It is an arithmetic number, because the mean of its divisors is an integer number (19297173153).

Almost surely, 2^77143232321 is an apocalyptic number.

It is an amenable number.

77143232321 is a deficient number, since it is larger than the sum of its proper divisors (45460291).

77143232321 is a wasteful number, since it uses less digits than its factorization.

77143232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45460290.

The product of its digits is 42336, while the sum is 35.

Adding to 77143232321 its reverse (12323234177), we get a palindrome (89466466498).

The spelling of 77143232321 in words is "seventy-seven billion, one hundred forty-three million, two hundred thirty-two thousand, three hundred twenty-one".