51307647066 has 48 divisors (see below), whose sum is σ = 122637813480. Its totient is φ = 15401917440.

The previous prime is 51307647043. The next prime is 51307647077. The reversal of 51307647066 is 66074670315.

51307647066 is a `hidden beast` number, since 51 + 3 + 0 + 76 + 470 + 66 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 37741221441 + 13566425625 = 194271^2 + 116475^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2664351 + ... + 2683538.

Almost surely, 2^51307647066 is an apocalyptic number.

51307647066 is an abundant number, since it is smaller than the sum of its proper divisors (71330166414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51307647066 is a wasteful number, since it uses less digits than its factorization.

51307647066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5347951 (or 5347948 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 51307647066 in words is "fifty-one billion, three hundred seven million, six hundred forty-seven thousand, sixty-six".