77243974321 has 8 divisors (see below), whose sum is σ = 78732699624. Its totient is φ = 75762424320.

The previous prime is 77243974279. The next prime is 77243974331. The reversal of 77243974321 is 12347934277.

It can be written as a sum of positive squares in 4 ways, for example, as 13758117025 + 63485857296 = 117295^2 + 251964^2 .

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 77243974321 - 2⁹ = 77243973809 is a prime.

It is a super-2 number, since 2×77243974321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77243974331) 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, 1772086 + ... + 1815151.

It is an arithmetic number, because the mean of its divisors is an integer number (9841587453).

Almost surely, 2^77243974321 is an apocalyptic number.

It is an amenable number.

77243974321 is a deficient number, since it is larger than the sum of its proper divisors (1488725303).

77243974321 is a wasteful number, since it uses less digits than its factorization.

77243974321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587651.

The product of its digits is 1778112, while the sum is 49.

The spelling of 77243974321 in words is "seventy-seven billion, two hundred forty-three million, nine hundred seventy-four thousand, three hundred twenty-one".