50661065155501 has 2 divisors, whose sum is σ = 50661065155502. Its totient is φ = 50661065155500.

The previous prime is 50661065155499. The next prime is 50661065155577. The reversal of 50661065155501 is 10555156016605.

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., 42072801186025 + 8588263969476 = 6486355^2 + 2930574^2 .

It is a cyclic number.

It is not a de Polignac number, because 50661065155501 - 2¹ = 50661065155499 is a prime.

It is a super-2 number, since 2×50661065155501² (a number of 28 digits) contains 22 as substring.

Together with 50661065155499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50661065155601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25330532577750 + 25330532577751.

It is an arithmetic number, because the mean of its divisors is an integer number (25330532577751).

Almost surely, 2^{50661065155501} is an apocalyptic number.

It is an amenable number.

50661065155501 is a deficient number, since it is larger than the sum of its proper divisors (1).

50661065155501 is an equidigital number, since it uses as much as digits as its factorization.

50661065155501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 675000, while the sum is 46.

The spelling of 50661065155501 in words is "fifty trillion, six hundred sixty-one billion, sixty-five million, one hundred fifty-five thousand, five hundred one".