660051606121 has 2 divisors, whose sum is σ = 660051606122. Its totient is φ = 660051606120.

The previous prime is 660051606077. The next prime is 660051606131. The reversal of 660051606121 is 121606150066.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 524553996121 + 135497610000 = 724261^2 + 368100^2 .

It is a cyclic number.

It is not a de Polignac number, because 660051606121 - 2¹⁷ = 660051475049 is a prime.

It is not a weakly prime, because it can be changed into another prime (660051606131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330025803060 + 330025803061.

It is an arithmetic number, because the mean of its divisors is an integer number (330025803061).

Almost surely, 2^660051606121 is an apocalyptic number.

It is an amenable number.

660051606121 is a deficient number, since it is larger than the sum of its proper divisors (1).

660051606121 is an equidigital number, since it uses as much as digits as its factorization.

660051606121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 660051606121 its reverse (121606150066), we get a palindrome (781657756187).

The spelling of 660051606121 in words is "six hundred sixty billion, fifty-one million, six hundred six thousand, one hundred twenty-one".