505431261769 has 4 divisors (see below), whose sum is σ = 577635727744. Its totient is φ = 433226795796.

The previous prime is 505431261763. The next prime is 505431261779. The reversal of 505431261769 is 967162134505.

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.

It is a cyclic number.

It is not a de Polignac number, because 505431261769 - 2⁵ = 505431261737 is a prime.

It is a super-2 number, since 2×505431261769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505431261763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36102232977 + ... + 36102232990.

It is an arithmetic number, because the mean of its divisors is an integer number (144408931936).

Almost surely, 2^505431261769 is an apocalyptic number.

It is an amenable number.

505431261769 is a deficient number, since it is larger than the sum of its proper divisors (72204465975).

505431261769 is an equidigital number, since it uses as much as digits as its factorization.

505431261769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72204465974.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 505431261769 in words is "five hundred five billion, four hundred thirty-one million, two hundred sixty-one thousand, seven hundred sixty-nine".