505347856969 has 4 divisors (see below), whose sum is σ = 506847405844. Its totient is φ = 503848308096.

The previous prime is 505347856921. The next prime is 505347856973. The reversal of 505347856969 is 969658743505.

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 383672464569 + 121675392400 = 619413^2 + 348820^2 .

It is a cyclic number.

It is not a de Polignac number, because 505347856969 - 2¹⁹ = 505347332681 is a prime.

It is a super-2 number, since 2×505347856969² (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 (505347854969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749773932 + ... + 749774605.

It is an arithmetic number, because the mean of its divisors is an integer number (126711851461).

Almost surely, 2^505347856969 is an apocalyptic number.

It is an amenable number.

505347856969 is a deficient number, since it is larger than the sum of its proper divisors (1499548875).

505347856969 is a wasteful number, since it uses less digits than its factorization.

505347856969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499548874.

The product of its (nonzero) digits is 244944000, while the sum is 67.

The spelling of 505347856969 in words is "five hundred five billion, three hundred forty-seven million, eight hundred fifty-six thousand, nine hundred sixty-nine".