55740497693581 has 2 divisors, whose sum is σ = 55740497693582. Its totient is φ = 55740497693580.

The previous prime is 55740497693557. The next prime is 55740497693603. The reversal of 55740497693581 is 18539679404755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55703608345225 + 36889348356 = 7463485^2 + 192066^2 .

It is a cyclic number.

It is not a de Polignac number, because 55740497693581 - 2⁷ = 55740497693453 is a prime.

It is a super-2 number, since 2×55740497693581² (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 (55740497693501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27870248846790 + 27870248846791.

It is an arithmetic number, because the mean of its divisors is an integer number (27870248846791).

Almost surely, 2^{55740497693581} is an apocalyptic number.

It is an amenable number.

55740497693581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55740497693581 is an equidigital number, since it uses as much as digits as its factorization.

55740497693581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072000, while the sum is 73.

The spelling of 55740497693581 in words is "fifty-five trillion, seven hundred forty billion, four hundred ninety-seven million, six hundred ninety-three thousand, five hundred eighty-one".