55577569 has 2 divisors, whose sum is σ = 55577570. Its totient is φ = 55577568.

The previous prime is 55577567. The next prime is 55577579. The reversal of 55577569 is 96577555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 27699169 = 5280^2 + 5263^2 .

It is a cyclic number.

It is not a de Polignac number, because 55577569 - 2¹ = 55577567 is a prime.

It is a super-2 number, since 2×55577569² = 6177732351899522, which contains 22 as substring.

Together with 55577567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55577567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27788784 + 27788785.

It is an arithmetic number, because the mean of its divisors is an integer number (27788785).

Almost surely, 2^55577569 is an apocalyptic number.

It is an amenable number.

55577569 is a deficient number, since it is larger than the sum of its proper divisors (1).

55577569 is an equidigital number, since it uses as much as digits as its factorization.

55577569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653750, while the sum is 49.

The square root of 55577569 is about 7455.0364854909. The cubic root of 55577569 is about 381.6218057360.

The spelling of 55577569 in words is "fifty-five million, five hundred seventy-seven thousand, five hundred sixty-nine".