55611569 has 4 divisors (see below), whose sum is σ = 59889396. Its totient is φ = 51333744.

The previous prime is 55611559. The next prime is 55611581. The reversal of 55611569 is 96511655.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96511655 = 5 ⋅19302331.

It can be written as a sum of positive squares in 2 ways, for example, as 2146225 + 53465344 = 1465^2 + 7312^2 .

It is a cyclic number.

It is not a de Polignac number, because 55611569 - 2⁴ = 55611553 is a prime.

It is a super-2 number, since 2×55611569² = 6185293213283522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55611529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138894 + ... + 2138919.

It is an arithmetic number, because the mean of its divisors is an integer number (14972349).

Almost surely, 2^55611569 is an apocalyptic number.

It is an amenable number.

55611569 is a deficient number, since it is larger than the sum of its proper divisors (4277827).

55611569 is a wasteful number, since it uses less digits than its factorization.

55611569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277826.

The product of its digits is 40500, while the sum is 38.

The square root of 55611569 is about 7457.3164744431. The cubic root of 55611569 is about 381.6996098853.

The spelling of 55611569 in words is "fifty-five million, six hundred eleven thousand, five hundred sixty-nine".