51666111100 has 36 divisors (see below), whose sum is σ = 112139800024. Its totient is φ = 20661958080.

The previous prime is 51666111089. The next prime is 51666111109. The reversal of 51666111100 is 111166615.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 427627 + ... + 534973.

Almost surely, 2^51666111100 is an apocalyptic number.

51666111100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51666111100 is an abundant number, since it is smaller than the sum of its proper divisors (60473688924).

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

51666111100 is a wasteful number, since it uses less digits than its factorization.

51666111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112174 (or 112167 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 28.

Adding to 51666111100 its reverse (111166615), we get a palindrome (51777277715).

The spelling of 51666111100 in words is "fifty-one billion, six hundred sixty-six million, one hundred eleven thousand, one hundred".