51166117211 has 4 divisors (see below), whose sum is σ = 55817582424. Its totient is φ = 46514652000.

The previous prime is 51166117207. The next prime is 51166117213. The reversal of 51166117211 is 11271166115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51166117211 - 2² = 51166117207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51166117213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2325732590 + ... + 2325732611.

It is an arithmetic number, because the mean of its divisors is an integer number (13954395606).

Almost surely, 2^51166117211 is an apocalyptic number.

51166117211 is a deficient number, since it is larger than the sum of its proper divisors (4651465213).

51166117211 is a wasteful number, since it uses less digits than its factorization.

51166117211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4651465212.

The product of its digits is 2520, while the sum is 32.

The spelling of 51166117211 in words is "fifty-one billion, one hundred sixty-six million, one hundred seventeen thousand, two hundred eleven".