55666457761577 has 24 divisors (see below), whose sum is σ = 61910252115264. Its totient is φ = 49993037849664.

The previous prime is 55666457761573. The next prime is 55666457761601. The reversal of 55666457761577 is 77516775466655.

55666457761577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55666457761577 - 2² = 55666457761573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55666457761498 and 55666457761507.

It is not an unprimeable number, because it can be changed into a prime (55666457761571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124605668 + ... + 125051610.

It is an arithmetic number, because the mean of its divisors is an integer number (2579593838136).

Almost surely, 2^{55666457761577} is an apocalyptic number.

It is an amenable number.

55666457761577 is a deficient number, since it is larger than the sum of its proper divisors (6243794353687).

55666457761577 is a wasteful number, since it uses less digits than its factorization.

55666457761577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465969 (or 465956 counting only the distinct ones).

The product of its digits is 7779240000, while the sum is 77.

The spelling of 55666457761577 in words is "fifty-five trillion, six hundred sixty-six billion, four hundred fifty-seven million, seven hundred sixty-one thousand, five hundred seventy-seven".