51660566436645 has 12 divisors (see below), whose sum is σ = 89544981823596. Its totient is φ = 27552302099520.

The previous prime is 51660566436547. The next prime is 51660566436649. The reversal of 51660566436645 is 54663466506615.

51660566436645 is a `hidden beast` number, since 5 + 1 + 6 + 6 + 0 + 566 + 4 + 3 + 6 + 64 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12034120574529 + 39626445862116 = 3469023^2 + 6294954^2 .

It is not a de Polignac number, because 51660566436645 - 2¹⁴ = 51660566420261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660566436649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574006293696 + ... + 574006293785.

It is an arithmetic number, because the mean of its divisors is an integer number (7462081818633).

Almost surely, 2^{51660566436645} is an apocalyptic number.

It is an amenable number.

51660566436645 is a deficient number, since it is larger than the sum of its proper divisors (37884415386951).

51660566436645 is a wasteful number, since it uses less digits than its factorization.

51660566436645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148012587492 (or 1148012587489 counting only the distinct ones).

The product of its (nonzero) digits is 279936000, while the sum is 63.

The spelling of 51660566436645 in words is "fifty-one trillion, six hundred sixty billion, five hundred sixty-six million, four hundred thirty-six thousand, six hundred forty-five".