50661660105509 has 2 divisors, whose sum is σ = 50661660105510. Its totient is φ = 50661660105508.

The previous prime is 50661660105499. The next prime is 50661660105523. The reversal of 50661660105509 is 90550106616605.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29367219237409 + 21294440868100 = 5419153^2 + 4614590^2 .

It is a cyclic number.

It is not a de Polignac number, because 50661660105509 - 2³⁶ = 50592940628773 is a prime.

It is a super-2 number, since 2×50661660105509² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50661660105599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25330830052754 + 25330830052755.

It is an arithmetic number, because the mean of its divisors is an integer number (25330830052755).

Almost surely, 2^{50661660105509} is an apocalyptic number.

It is an amenable number.

50661660105509 is a deficient number, since it is larger than the sum of its proper divisors (1).

50661660105509 is an equidigital number, since it uses as much as digits as its factorization.

50661660105509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The spelling of 50661660105509 in words is "fifty trillion, six hundred sixty-one billion, six hundred sixty million, one hundred five thousand, five hundred nine".