51666111101 has 8 divisors (see below), whose sum is σ = 56646264000. Its totient is φ = 46733163840.

The previous prime is 51666111089. The next prime is 51666111109. The reversal of 51666111101 is 10111166615.

It is a happy number.

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

It is not a de Polignac number, because 51666111101 - 2²² = 51661916797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666111109) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11799116 + ... + 11803493.

It is an arithmetic number, because the mean of its divisors is an integer number (7080783000).

Almost surely, 2^51666111101 is an apocalyptic number.

It is an amenable number.

51666111101 is a deficient number, since it is larger than the sum of its proper divisors (4980152899).

51666111101 is a wasteful number, since it uses less digits than its factorization.

51666111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23602819.

The product of its (nonzero) digits is 1080, while the sum is 29.

Adding to 51666111101 its reverse (10111166615), we get a palindrome (61777277716).

The spelling of 51666111101 in words is "fifty-one billion, six hundred sixty-six million, one hundred eleven thousand, one hundred one".