51665670166 has 64 divisors (see below), whose sum is σ = 87397263360. Its totient is φ = 22705349760.

The previous prime is 51665670163. The next prime is 51665670167. The reversal of 51665670166 is 66107656615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665670163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62776831 + ... + 62777653.

It is an arithmetic number, because the mean of its divisors is an integer number (1365582240).

Almost surely, 2^51665670166 is an apocalyptic number.

51665670166 is a deficient number, since it is larger than the sum of its proper divisors (35731593194).

51665670166 is a wasteful number, since it uses less digits than its factorization.

51665670166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 51665670166 in words is "fifty-one billion, six hundred sixty-five million, six hundred seventy thousand, one hundred sixty-six".