506431166661 has 12 divisors (see below), whose sum is σ = 836013354592. Its totient is φ = 289389238056.

The previous prime is 506431166641. The next prime is 506431166677. The reversal of 506431166661 is 166661134605.

It is not a de Polignac number, because 506431166661 - 2¹⁹ = 506430642373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506431166641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4019294911 + ... + 4019295036.

Almost surely, 2^506431166661 is an apocalyptic number.

It is an amenable number.

506431166661 is a deficient number, since it is larger than the sum of its proper divisors (329582187931).

506431166661 is a wasteful number, since it uses less digits than its factorization.

506431166661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8038589960 (or 8038589957 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 506431166661 in words is "five hundred six billion, four hundred thirty-one million, one hundred sixty-six thousand, six hundred sixty-one".