51442242857 has 4 divisors (see below), whose sum is σ = 51474741120. Its totient is φ = 51409744596.

The previous prime is 51442242829. The next prime is 51442242871. The reversal of 51442242857 is 75824224415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51442242857 - 2⁸ = 51442242601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51442242757) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 16246757 + ... + 16249922.

It is an arithmetic number, because the mean of its divisors is an integer number (12868685280).

Almost surely, 2^51442242857 is an apocalyptic number.

It is an amenable number.

51442242857 is a deficient number, since it is larger than the sum of its proper divisors (32498263).

51442242857 is a wasteful number, since it uses less digits than its factorization.

51442242857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32498262.

The product of its digits is 716800, while the sum is 44.

The spelling of 51442242857 in words is "fifty-one billion, four hundred forty-two million, two hundred forty-two thousand, eight hundred fifty-seven".