505431175720 has 16 divisors (see below), whose sum is σ = 1137220145460. Its totient is φ = 202172470272.

The previous prime is 505431175673. The next prime is 505431175729. The reversal of 505431175720 is 27571134505.

It can be written as a sum of positive squares in 2 ways, for example, as 467864208036 + 37566967684 = 684006^2 + 193822^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 12635779393 = 505431175720 / (5 + 0 + 5 + 4 + 3 + 1 + 1 + 7 + 5 + 7 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (505431175729) 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, 6317889657 + ... + 6317889736.

Almost surely, 2^505431175720 is an apocalyptic number.

It is an amenable number.

505431175720 is an abundant number, since it is smaller than the sum of its proper divisors (631788969740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505431175720 is a wasteful number, since it uses less digits than its factorization.

505431175720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12635779404 (or 12635779400 counting only the distinct ones).

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 505431175720 in words is "five hundred five billion, four hundred thirty-one million, one hundred seventy-five thousand, seven hundred twenty".