51366818 has 4 divisors (see below), whose sum is σ = 77050230. Its totient is φ = 25683408.

The previous prime is 51366787. The next prime is 51366829. The reversal of 51366818 is 81866315.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 47513449 + 3853369 = 6893^2 + 1963^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12841703 + ... + 12841706.

Almost surely, 2^51366818 is an apocalyptic number.

51366818 is a deficient number, since it is larger than the sum of its proper divisors (25683412).

51366818 is a wasteful number, since it uses less digits than its factorization.

51366818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25683411.

The product of its digits is 34560, while the sum is 38.

The square root of 51366818 is about 7167.0648106460. The cubic root of 51366818 is about 371.7299510391.

The spelling of 51366818 in words is "fifty-one million, three hundred sixty-six thousand, eight hundred eighteen".