55561665 has 8 divisors (see below), whose sum is σ = 88898688. Its totient is φ = 29632880.

The previous prime is 55561663. The next prime is 55561669. The reversal of 55561665 is 56616555.

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

It is not a de Polignac number, because 55561665 - 2¹ = 55561663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55561663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1852041 + ... + 1852070.

It is an arithmetic number, because the mean of its divisors is an integer number (11112336).

Almost surely, 2^55561665 is an apocalyptic number.

It is an amenable number.

55561665 is a deficient number, since it is larger than the sum of its proper divisors (33337023).

55561665 is a wasteful number, since it uses less digits than its factorization.

55561665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3704119.

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

The square root of 55561665 is about 7453.9697477250. The cubic root of 55561665 is about 381.5854008079.

The spelling of 55561665 in words is "fifty-five million, five hundred sixty-one thousand, six hundred sixty-five".