75505555 has 4 divisors (see below), whose sum is σ = 90606672. Its totient is φ = 60404440.

The previous prime is 75505523. The next prime is 75505603. The reversal of 75505555 is 55550557.

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

It is not a de Polignac number, because 75505555 - 2⁵ = 75505523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7550551 + ... + 7550560.

It is an arithmetic number, because the mean of its divisors is an integer number (22651668).

Almost surely, 2^75505555 is an apocalyptic number.

75505555 is a deficient number, since it is larger than the sum of its proper divisors (15101117).

75505555 is a wasteful number, since it uses less digits than its factorization.

75505555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15101116.

The product of its (nonzero) digits is 109375, while the sum is 37.

The square root of 75505555 is about 8689.3932469419. The cubic root of 75505555 is about 422.6617706208.

The spelling of 75505555 in words is "seventy-five million, five hundred five thousand, five hundred fifty-five".