51000555559999 has 4 divisors (see below), whose sum is σ = 51000691751920. Its totient is φ = 51000419368080.

The previous prime is 51000555559991. The next prime is 51000555560011. The reversal of 51000555559999 is 99995555500015.

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

It is a cyclic number.

It is not a de Polignac number, because 51000555559999 - 2³ = 51000555559991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000555559991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67532694 + ... + 68283715.

It is an arithmetic number, because the mean of its divisors is an integer number (12750172937980).

Almost surely, 2^{51000555559999} is an apocalyptic number.

51000555559999 is a deficient number, since it is larger than the sum of its proper divisors (136191921).

51000555559999 is a wasteful number, since it uses less digits than its factorization.

51000555559999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136191920.

The product of its (nonzero) digits is 102515625, while the sum is 67.

The spelling of 51000555559999 in words is "fifty-one trillion, five hundred fifty-five million, five hundred fifty-nine thousand, nine hundred ninety-nine".