55571765 has 4 divisors (see below), whose sum is σ = 66686124. Its totient is φ = 44457408.

The previous prime is 55571741. The next prime is 55571773. The reversal of 55571765 is 56717555.

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 39112516 + 16459249 = 6254^2 + 4057^2 .

It is a cyclic number.

It is not a de Polignac number, because 55571765 - 2⁶ = 55571701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5557172 + ... + 5557181.

It is an arithmetic number, because the mean of its divisors is an integer number (16671531).

Almost surely, 2^55571765 is an apocalyptic number.

It is an amenable number.

55571765 is a deficient number, since it is larger than the sum of its proper divisors (11114359).

55571765 is a wasteful number, since it uses less digits than its factorization.

55571765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11114358.

The product of its digits is 183750, while the sum is 41.

The square root of 55571765 is about 7454.6472082856. The cubic root of 55571765 is about 381.6085209396.

The spelling of 55571765 in words is "fifty-five million, five hundred seventy-one thousand, seven hundred sixty-five".