505551606631 has 4 divisors (see below), whose sum is σ = 517882133664. Its totient is φ = 493221079600.

The previous prime is 505551606629. The next prime is 505551606649. The reversal of 505551606631 is 136606155505.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 505551606631 - 2¹ = 505551606629 is a prime.

It is a super-2 number, since 2×505551606631² (a number of 24 digits) contains 22 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 (505551606611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6165263455 + ... + 6165263536.

It is an arithmetic number, because the mean of its divisors is an integer number (129470533416).

Almost surely, 2^505551606631 is an apocalyptic number.

505551606631 is a deficient number, since it is larger than the sum of its proper divisors (12330527033).

505551606631 is a wasteful number, since it uses less digits than its factorization.

505551606631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12330527032.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 505551606631 in words is "five hundred five billion, five hundred fifty-one million, six hundred six thousand, six hundred thirty-one".