51556278075121 has 8 divisors (see below), whose sum is σ = 55151773515720. Its totient is φ = 48023312990208.

The previous prime is 51556278075101. The next prime is 51556278075209. The reversal of 51556278075121 is 12157087265515.

It can be written as a sum of positive squares in 4 ways, for example, as 11309130039025 + 40247148036096 = 3362905^2 + 6344064^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51556278075121 - 2¹⁷ = 51556277944049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51556278075101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15632587216 + ... + 15632590513.

It is an arithmetic number, because the mean of its divisors is an integer number (6893971689465).

Almost surely, 2^{51556278075121} is an apocalyptic number.

It is an amenable number.

51556278075121 is a deficient number, since it is larger than the sum of its proper divisors (3595495440599).

51556278075121 is a wasteful number, since it uses less digits than its factorization.

51556278075121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31265177843.

The product of its (nonzero) digits is 5880000, while the sum is 55.

The spelling of 51556278075121 in words is "fifty-one trillion, five hundred fifty-six billion, two hundred seventy-eight million, seventy-five thousand, one hundred twenty-one".