53661336167557 has 2 divisors, whose sum is σ = 53661336167558. Its totient is φ = 53661336167556.

The previous prime is 53661336167531. The next prime is 53661336167617. The reversal of 53661336167557 is 75576163316635.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44272069683076 + 9389266484481 = 6653726^2 + 3064191^2 .

It is a cyclic number.

It is not a de Polignac number, because 53661336167557 - 2¹¹ = 53661336165509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53661336165557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26830668083778 + 26830668083779.

It is an arithmetic number, because the mean of its divisors is an integer number (26830668083779).

Almost surely, 2^{53661336167557} is an apocalyptic number.

It is an amenable number.

53661336167557 is a deficient number, since it is larger than the sum of its proper divisors (1).

53661336167557 is an equidigital number, since it uses as much as digits as its factorization.

53661336167557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326000, while the sum is 64.

The spelling of 53661336167557 in words is "fifty-three trillion, six hundred sixty-one billion, three hundred thirty-six million, one hundred sixty-seven thousand, five hundred fifty-seven".