51222463442 has 4 divisors (see below), whose sum is σ = 76833695166. Its totient is φ = 25611231720.

The previous prime is 51222463417. The next prime is 51222463463. The reversal of 51222463442 is 24436422215.

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., 49943757361 + 1278706081 = 223481^2 + 35759^2 .

It is a super-2 number, since 2×51222463442² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12805615859 + ... + 12805615862.

Almost surely, 2^51222463442 is an apocalyptic number.

51222463442 is a deficient number, since it is larger than the sum of its proper divisors (25611231724).

51222463442 is a wasteful number, since it uses less digits than its factorization.

51222463442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25611231723.

The product of its digits is 92160, while the sum is 35.

Adding to 51222463442 its reverse (24436422215), we get a palindrome (75658885657).

The spelling of 51222463442 in words is "fifty-one billion, two hundred twenty-two million, four hundred sixty-three thousand, four hundred forty-two".