506656101661 has 4 divisors (see below), whose sum is σ = 520349509852. Its totient is φ = 492962693472.

The previous prime is 506656101659. The next prime is 506656101667. The reversal of 506656101661 is 166101656605.

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 466754041636 + 39902060025 = 683194^2 + 199755^2 .

It is a cyclic number.

It is not a de Polignac number, because 506656101661 - 2¹ = 506656101659 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 (506656101667) 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, 6846704040 + ... + 6846704113.

It is an arithmetic number, because the mean of its divisors is an integer number (130087377463).

Almost surely, 2^506656101661 is an apocalyptic number.

It is an amenable number.

506656101661 is a deficient number, since it is larger than the sum of its proper divisors (13693408191).

506656101661 is a wasteful number, since it uses less digits than its factorization.

506656101661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13693408190.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 506656101661 in words is "five hundred six billion, six hundred fifty-six million, one hundred one thousand, six hundred sixty-one".