51612452842 has 4 divisors (see below), whose sum is σ = 77418679266. Its totient is φ = 25806226420.

The previous prime is 51612452821. The next prime is 51612452861. The reversal of 51612452842 is 24825421615.

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., 48100823761 + 3511629081 = 219319^2 + 59259^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 51612452795 and 51612452804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12903113209 + ... + 12903113212.

Almost surely, 2^51612452842 is an apocalyptic number.

51612452842 is a deficient number, since it is larger than the sum of its proper divisors (25806226424).

51612452842 is a wasteful number, since it uses less digits than its factorization.

51612452842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25806226423.

The product of its digits is 153600, while the sum is 40.

The spelling of 51612452842 in words is "fifty-one billion, six hundred twelve million, four hundred fifty-two thousand, eight hundred forty-two".