55405569 has 8 divisors (see below), whose sum is σ = 73939392. Its totient is φ = 36904400.

The previous prime is 55405561. The next prime is 55405607. The reversal of 55405569 is 96550455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55405569 - 2³ = 55405561 is a prime.

It is a super-2 number, since 2×55405569² = 6139554152427522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55405561) 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 in 7 ways as a sum of consecutive naturals, for example, 3882 + ... + 11219.

It is an arithmetic number, because the mean of its divisors is an integer number (9242424).

Almost surely, 2^55405569 is an apocalyptic number.

It is an amenable number.

55405569 is a deficient number, since it is larger than the sum of its proper divisors (18533823).

55405569 is a wasteful number, since it uses less digits than its factorization.

55405569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16327.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 55405569 is about 7443.4917209600. The cubic root of 55405569 is about 381.2277212100.

The spelling of 55405569 in words is "fifty-five million, four hundred five thousand, five hundred sixty-nine".