51660564381447 has 32 divisors (see below), whose sum is σ = 79470846359040. Its totient is φ = 29239428556800.

The previous prime is 51660564381443. The next prime is 51660564381449. The reversal of 51660564381447 is 74418346506615.

It is not a de Polignac number, because 51660564381447 - 2² = 51660564381443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660564381443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3776929 + ... + 10843722.

It is an arithmetic number, because the mean of its divisors is an integer number (2483463948720).

Almost surely, 2^{51660564381447} is an apocalyptic number.

51660564381447 is a deficient number, since it is larger than the sum of its proper divisors (27810281977593).

51660564381447 is a wasteful number, since it uses less digits than its factorization.

51660564381447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14622263.

The product of its (nonzero) digits is 58060800, while the sum is 60.

The spelling of 51660564381447 in words is "fifty-one trillion, six hundred sixty billion, five hundred sixty-four million, three hundred eighty-one thousand, four hundred forty-seven".