55212166 has 4 divisors (see below), whose sum is σ = 82818252. Its totient is φ = 27606082.

The previous prime is 55212127. The next prime is 55212173. The reversal of 55212166 is 66121255.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13803040 + ... + 13803043.

It is an arithmetic number, because the mean of its divisors is an integer number (20704563).

Almost surely, 2^55212166 is an apocalyptic number.

55212166 is a deficient number, since it is larger than the sum of its proper divisors (27606086).

55212166 is a wasteful number, since it uses less digits than its factorization.

55212166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27606085.

The product of its digits is 3600, while the sum is 28.

The square root of 55212166 is about 7430.4889475727. The cubic root of 55212166 is about 380.7836230025.

The spelling of 55212166 in words is "fifty-five million, two hundred twelve thousand, one hundred sixty-six".