51776306721445 has 8 divisors (see below), whose sum is σ = 63058904902944. Its totient is φ = 40802820819024.

The previous prime is 51776306721421. The next prime is 51776306721449. The reversal of 51776306721445 is 54412760367715.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51776306721445 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51776306721445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51776306721449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77278069399 + ... + 77278070068.

It is an arithmetic number, because the mean of its divisors is an integer number (7882363112868).

Almost surely, 2^{51776306721445} is an apocalyptic number.

It is an amenable number.

51776306721445 is a deficient number, since it is larger than the sum of its proper divisors (11282598181499).

51776306721445 is a wasteful number, since it uses less digits than its factorization.

51776306721445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154556139539.

The product of its (nonzero) digits is 29635200, while the sum is 58.

The spelling of 51776306721445 in words is "fifty-one trillion, seven hundred seventy-six billion, three hundred six million, seven hundred twenty-one thousand, four hundred forty-five".