77803218073 has 6 divisors (see below), whose sum is σ = 90505784346. Its totient is φ = 66688472592.

The previous prime is 77803218071. The next prime is 77803218107. The reversal of 77803218073 is 37081230877.

It can be written as a sum of positive squares in only one way, i.e., 71039307024 + 6763911049 = 266532^2 + 82243^2 .

It is not a de Polignac number, because 77803218073 - 2¹ = 77803218071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77803218071) 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 5 ways as a sum of consecutive naturals, for example, 793910340 + ... + 793910437.

It is an arithmetic number, because the mean of its divisors is an integer number (15084297391).

Almost surely, 2^77803218073 is an apocalyptic number.

It is an amenable number.

77803218073 is a deficient number, since it is larger than the sum of its proper divisors (12702566273).

77803218073 is a wasteful number, since it uses less digits than its factorization.

77803218073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587820791 (or 1587820784 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 77803218073 in words is "seventy-seven billion, eight hundred three million, two hundred eighteen thousand, seventy-three".