54040315561 has 2 divisors, whose sum is σ = 54040315562. Its totient is φ = 54040315560.

The previous prime is 54040315559. The next prime is 54040315577. The reversal of 54040315561 is 16551304045.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38330199961 + 15710115600 = 195781^2 + 125340^2 .

It is a cyclic number.

It is not a de Polignac number, because 54040315561 - 2¹ = 54040315559 is a prime.

Together with 54040315559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (54040315501) 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, 27020157780 + 27020157781.

It is an arithmetic number, because the mean of its divisors is an integer number (27020157781).

Almost surely, 2^54040315561 is an apocalyptic number.

It is an amenable number.

54040315561 is a deficient number, since it is larger than the sum of its proper divisors (1).

54040315561 is an equidigital number, since it uses as much as digits as its factorization.

54040315561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 54040315561 in words is "fifty-four billion, forty million, three hundred fifteen thousand, five hundred sixty-one".