55211566 has 8 divisors (see below), whose sum is σ = 83296584. Its totient is φ = 27446040.

The previous prime is 55211561. The next prime is 55211593. The reversal of 55211566 is 66511255.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55211561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79440 + ... + 80131.

It is an arithmetic number, because the mean of its divisors is an integer number (10412073).

Almost surely, 2^55211566 is an apocalyptic number.

55211566 is a deficient number, since it is larger than the sum of its proper divisors (28085018).

55211566 is a wasteful number, since it uses less digits than its factorization.

55211566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159746.

The product of its digits is 9000, while the sum is 31.

The square root of 55211566 is about 7430.4485732693. The cubic root of 55211566 is about 380.7822436507.

The spelling of 55211566 in words is "fifty-five million, two hundred eleven thousand, five hundred sixty-six".