77440485889 has 4 divisors (see below), whose sum is σ = 83397446356. Its totient is φ = 71483525424.

The previous prime is 77440485869. The next prime is 77440485929. The reversal of 77440485889 is 98858404477.

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 36062010000 + 41378475889 = 189900^2 + 203417^2 .

It is a cyclic number.

It is not a de Polignac number, because 77440485889 - 2¹⁹ = 77439961601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77440485889.

It is not an unprimeable number, because it can be changed into a prime (77440485869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2978480214 + ... + 2978480239.

It is an arithmetic number, because the mean of its divisors is an integer number (20849361589).

Almost surely, 2^77440485889 is an apocalyptic number.

It is an amenable number.

77440485889 is a deficient number, since it is larger than the sum of its proper divisors (5956960467).

77440485889 is a wasteful number, since it uses less digits than its factorization.

77440485889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5956960466.

The product of its (nonzero) digits is 72253440, while the sum is 64.

The spelling of 77440485889 in words is "seventy-seven billion, four hundred forty million, four hundred eighty-five thousand, eight hundred eighty-nine".