511016106661 has 2 divisors, whose sum is σ = 511016106662. Its totient is φ = 511016106660.

The previous prime is 511016106631. The next prime is 511016106691. The reversal of 511016106661 is 166601610115.

It is a balanced prime because it is at equal distance from previous prime (511016106631) and next prime (511016106691).

It can be written as a sum of positive squares in only one way, i.e., 424289390625 + 86726716036 = 651375^2 + 294494^2 .

It is a cyclic number.

It is not a de Polignac number, because 511016106661 - 2²⁵ = 510982552229 is a prime.

It is a super-2 number, since 2×511016106661² (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 (511016106611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255508053330 + 255508053331.

It is an arithmetic number, because the mean of its divisors is an integer number (255508053331).

Almost surely, 2^511016106661 is an apocalyptic number.

It is an amenable number.

511016106661 is a deficient number, since it is larger than the sum of its proper divisors (1).

511016106661 is an equidigital number, since it uses as much as digits as its factorization.

511016106661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

Adding to 511016106661 its reverse (166601610115), we get a palindrome (677617716776).

The spelling of 511016106661 in words is "five hundred eleven billion, sixteen million, one hundred six thousand, six hundred sixty-one".