55806471581317 has 2 divisors, whose sum is σ = 55806471581318. Its totient is φ = 55806471581316.

The previous prime is 55806471581281. The next prime is 55806471581347. The reversal of 55806471581317 is 71318517460855.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54331434612196 + 1475036969121 = 7370986^2 + 1214511^2 .

It is a cyclic number.

It is not a de Polignac number, because 55806471581317 - 2³⁵ = 55772111842949 is a prime.

It is a super-2 number, since 2×55806471581317² (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 (55806471581347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27903235790658 + 27903235790659.

It is an arithmetic number, because the mean of its divisors is an integer number (27903235790659).

Almost surely, 2^{55806471581317} is an apocalyptic number.

It is an amenable number.

55806471581317 is a deficient number, since it is larger than the sum of its proper divisors (1).

55806471581317 is an equidigital number, since it uses as much as digits as its factorization.

55806471581317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224000, while the sum is 61.

The spelling of 55806471581317 in words is "fifty-five trillion, eight hundred six billion, four hundred seventy-one million, five hundred eighty-one thousand, three hundred seventeen".