55691568677 has 2 divisors, whose sum is σ = 55691568678. Its totient is φ = 55691568676.

The previous prime is 55691568641. The next prime is 55691568701. The reversal of 55691568677 is 77686519655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42481744321 + 13209824356 = 206111^2 + 114934^2 .

It is a cyclic number.

It is not a de Polignac number, because 55691568677 - 2¹⁰ = 55691567653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55691568617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27845784338 + 27845784339.

It is an arithmetic number, because the mean of its divisors is an integer number (27845784339).

Almost surely, 2^55691568677 is an apocalyptic number.

It is an amenable number.

55691568677 is a deficient number, since it is larger than the sum of its proper divisors (1).

55691568677 is an equidigital number, since it uses as much as digits as its factorization.

55691568677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256000, while the sum is 65.

The spelling of 55691568677 in words is "fifty-five billion, six hundred ninety-one million, five hundred sixty-eight thousand, six hundred seventy-seven".