51666515612205 has 16 divisors (see below), whose sum is σ = 89025380747520. Its totient is φ = 25435823070528.

The previous prime is 51666515612167. The next prime is 51666515612251. The reversal of 51666515612205 is 50221651566615.

It is not a de Polignac number, because 51666515612205 - 2³⁹ = 51116759798317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132478244965 + ... + 132478245354.

It is an arithmetic number, because the mean of its divisors is an integer number (5564086296720).

Almost surely, 2^{51666515612205} is an apocalyptic number.

It is an amenable number.

51666515612205 is a deficient number, since it is larger than the sum of its proper divisors (37358865135315).

51666515612205 is a wasteful number, since it uses less digits than its factorization.

51666515612205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264956490340.

The product of its (nonzero) digits is 3240000, while the sum is 51.

The spelling of 51666515612205 in words is "fifty-one trillion, six hundred sixty-six billion, five hundred fifteen million, six hundred twelve thousand, two hundred five".