506156616661 has 2 divisors, whose sum is σ = 506156616662. Its totient is φ = 506156616660.

The previous prime is 506156616631. The next prime is 506156616697. The reversal of 506156616661 is 166616651605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 428100638436 + 78055978225 = 654294^2 + 279385^2 .

It is a cyclic number.

It is not a de Polignac number, because 506156616661 - 2⁵ = 506156616629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (506156616611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253078308330 + 253078308331.

It is an arithmetic number, because the mean of its divisors is an integer number (253078308331).

Almost surely, 2^506156616661 is an apocalyptic number.

It is an amenable number.

506156616661 is a deficient number, since it is larger than the sum of its proper divisors (1).

506156616661 is an equidigital number, since it uses as much as digits as its factorization.

506156616661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 506156616661 in words is "five hundred six billion, one hundred fifty-six million, six hundred sixteen thousand, six hundred sixty-one".