506561666111 has 8 divisors (see below), whose sum is σ = 525096594000. Its totient is φ = 488097890560.

The previous prime is 506561666101. The next prime is 506561666119. The reversal of 506561666111 is 111666165605.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 506561666111 - 2⁶ = 506561666047 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 (506561666119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17773586 + ... + 17802063.

It is an arithmetic number, because the mean of its divisors is an integer number (65637074250).

Almost surely, 2^506561666111 is an apocalyptic number.

506561666111 is a deficient number, since it is larger than the sum of its proper divisors (18534927889).

506561666111 is a wasteful number, since it uses less digits than its factorization.

506561666111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35576169.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 506561666111 in words is "five hundred six billion, five hundred sixty-one million, six hundred sixty-six thousand, one hundred eleven".