55616565 has 8 divisors (see below), whose sum is σ = 88986528.
Its totient is φ = 29662160.
The previous prime is 55616563. The next prime is 55616593. The reversal of 55616565 is 56561655.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 55616565 - 21 = 55616563 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (55616563) 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, 1853871 + ... + 1853900.
It is an arithmetic number, because the mean of its divisors is an integer number (11123316).
Almost surely, 255616565 is an apocalyptic number.
It is an amenable number.
55616565 is a deficient number, since it is larger than the sum of its proper divisors (33369963).
55616565 is a wasteful number, since it uses less digits than its factorization.
55616565 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3707779.
The product of its digits is 135000, while the sum is 39.
The square root of 55616565 is about 7457.6514399642.
The cubic root of 55616565 is about 381.7110398460.
The spelling of 55616565 in words is "fifty-five million, six hundred sixteen thousand, five hundred sixty-five".