51166222 has 4 divisors (see below), whose sum is σ = 76749336. Its totient is φ = 25583110.

The previous prime is 51166217. The next prime is 51166229. The reversal of 51166222 is 22266115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22266115 = 5 ⋅4453223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51166229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12791554 + ... + 12791557.

It is an arithmetic number, because the mean of its divisors is an integer number (19187334).

Almost surely, 2^51166222 is an apocalyptic number.

51166222 is a deficient number, since it is larger than the sum of its proper divisors (25583114).

51166222 is a wasteful number, since it uses less digits than its factorization.

51166222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25583113.

The product of its digits is 1440, while the sum is 25.

The square root of 51166222 is about 7153.0568290766. The cubic root of 51166222 is about 371.2454306065.

The spelling of 51166222 in words is "fifty-one million, one hundred sixty-six thousand, two hundred twenty-two".