51550166 has 4 divisors (see below), whose sum is σ = 77325252. Its totient is φ = 25775082.

The previous prime is 51550159. The next prime is 51550181. The reversal of 51550166 is 66105515.

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

It is a super-2 number, since 2×51550166² = 5314839229255112, which contains 22 as substring.

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, 12887540 + ... + 12887543.

It is an arithmetic number, because the mean of its divisors is an integer number (19331313).

Almost surely, 2^51550166 is an apocalyptic number.

51550166 is a deficient number, since it is larger than the sum of its proper divisors (25775086).

51550166 is a wasteful number, since it uses less digits than its factorization.

51550166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25775085.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51550166 is about 7179.8444272839. The cubic root of 51550166 is about 372.1717084129.

The spelling of 51550166 in words is "fifty-one million, five hundred fifty thousand, one hundred sixty-six".