55550665 has 4 divisors (see below), whose sum is σ = 66660804. Its totient is φ = 44440528.

The previous prime is 55550641. The next prime is 55550701. The reversal of 55550665 is 56605555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8874441 + 46676224 = 2979^2 + 6832^2 .

It is a cyclic number.

It is not a de Polignac number, because 55550665 - 2⁵ = 55550633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5555062 + ... + 5555071.

It is an arithmetic number, because the mean of its divisors is an integer number (16665201).

Almost surely, 2^55550665 is an apocalyptic number.

It is an amenable number.

55550665 is a deficient number, since it is larger than the sum of its proper divisors (11110139).

55550665 is a wasteful number, since it uses less digits than its factorization.

55550665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11110138.

The product of its (nonzero) digits is 112500, while the sum is 37.

The square root of 55550665 is about 7453.2318493389. The cubic root of 55550665 is about 381.5602172787.

The spelling of 55550665 in words is "fifty-five million, five hundred fifty thousand, six hundred sixty-five".