51005056155666 has 8 divisors (see below), whose sum is σ = 102010112311344. Its totient is φ = 17001685385220.

The previous prime is 51005056155631. The next prime is 51005056155701. The reversal of 51005056155666 is 66655165050015.

It is an interprime number because it is at equal distance from previous prime (51005056155631) and next prime (51005056155701).

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

51005056155666 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250421346300 + ... + 4250421346311.

It is an arithmetic number, because the mean of its divisors is an integer number (12751264038918).

Almost surely, 2^{51005056155666} is an apocalyptic number.

51005056155666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51005056155666 is a wasteful number, since it uses less digits than its factorization.

51005056155666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8500842692616.

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 51005056155666 in words is "fifty-one trillion, five billion, fifty-six million, one hundred fifty-five thousand, six hundred sixty-six".