511010561111 has 2 divisors, whose sum is σ = 511010561112. Its totient is φ = 511010561110.

The previous prime is 511010561077. The next prime is 511010561147. The reversal of 511010561111 is 111165010115.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511010561111 is a prime.

It is a super-2 number, since 2×511010561111² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511010561011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255505280555 + 255505280556.

It is an arithmetic number, because the mean of its divisors is an integer number (255505280556).

Almost surely, 2^511010561111 is an apocalyptic number.

511010561111 is a deficient number, since it is larger than the sum of its proper divisors (1).

511010561111 is an equidigital number, since it uses as much as digits as its factorization.

511010561111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 23.

Adding to 511010561111 its reverse (111165010115), we get a palindrome (622175571226).

The spelling of 511010561111 in words is "five hundred eleven billion, ten million, five hundred sixty-one thousand, one hundred eleven".