77213567789 has 4 divisors (see below), whose sum is σ = 80570679456. Its totient is φ = 73856456124.

The previous prime is 77213567779. The next prime is 77213567807. The reversal of 77213567789 is 98776531277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98776531277 = 144757 ⋅682361.

It is a cyclic number.

It is not a de Polignac number, because 77213567789 - 2²⁰ = 77212519213 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 (77213567759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1678555799 + ... + 1678555844.

It is an arithmetic number, because the mean of its divisors is an integer number (20142669864).

Almost surely, 2^77213567789 is an apocalyptic number.

It is an amenable number.

77213567789 is a deficient number, since it is larger than the sum of its proper divisors (3357111667).

77213567789 is a wasteful number, since it uses less digits than its factorization.

77213567789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357111666.

The product of its digits is 31116960, while the sum is 62.

The spelling of 77213567789 in words is "seventy-seven billion, two hundred thirteen million, five hundred sixty-seven thousand, seven hundred eighty-nine".