505818557077 has 4 divisors (see below), whose sum is σ = 505823849100. Its totient is φ = 505813265056.

The previous prime is 505818557063. The next prime is 505818557131. The reversal of 505818557077 is 770755818505.

It is a happy number.

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 72188405041 + 433630152036 = 268679^2 + 658506^2 .

It is a cyclic number.

It is not a de Polignac number, because 505818557077 - 2¹¹ = 505818555029 is a prime.

It is a super-5 number, since 5×505818557077⁵ (a number of 60 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505818557047) 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, 2499952 + ... + 2694697.

It is an arithmetic number, because the mean of its divisors is an integer number (126455962275).

Almost surely, 2^505818557077 is an apocalyptic number.

It is an amenable number.

505818557077 is a deficient number, since it is larger than the sum of its proper divisors (5292023).

505818557077 is an equidigital number, since it uses as much as digits as its factorization.

505818557077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5292022.

The product of its (nonzero) digits is 13720000, while the sum is 58.

The spelling of 505818557077 in words is "five hundred five billion, eight hundred eighteen million, five hundred fifty-seven thousand, seventy-seven".