55555509566 has 8 divisors (see below), whose sum is σ = 84097790040. Its totient is φ = 27522912888.

The previous prime is 55555509547. The next prime is 55555509619. The reversal of 55555509566 is 66590555555.

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

It is a congruent 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, 127420676 + ... + 127421111.

It is an arithmetic number, because the mean of its divisors is an integer number (10512223755).

Almost surely, 2^55555509566 is an apocalyptic number.

55555509566 is a deficient number, since it is larger than the sum of its proper divisors (28542280474).

55555509566 is a wasteful number, since it uses less digits than its factorization.

55555509566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254841898.

The product of its (nonzero) digits is 25312500, while the sum is 56.

The spelling of 55555509566 in words is "fifty-five billion, five hundred fifty-five million, five hundred nine thousand, five hundred sixty-six".