55537873561 has 2 divisors, whose sum is σ = 55537873562. Its totient is φ = 55537873560.

The previous prime is 55537873499. The next prime is 55537873577. The reversal of 55537873561 is 16537873555.

55537873561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53896408336 + 1641465225 = 232156^2 + 40515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55537873561 is a prime.

It is not a weakly prime, because it can be changed into another prime (55537873861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27768936780 + 27768936781.

It is an arithmetic number, because the mean of its divisors is an integer number (27768936781).

Almost surely, 2^55537873561 is an apocalyptic number.

It is an amenable number.

55537873561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55537873561 is an equidigital number, since it uses as much as digits as its factorization.

55537873561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230000, while the sum is 55.

The spelling of 55537873561 in words is "fifty-five billion, five hundred thirty-seven million, eight hundred seventy-three thousand, five hundred sixty-one".