51666129 has 6 divisors (see below), whose sum is σ = 74628866. Its totient is φ = 34444080.

The previous prime is 51666103. The next prime is 51666137. The reversal of 51666129 is 92166615.

It can be written as a sum of positive squares in only one way, i.e., 50339025 + 1327104 = 7095^2 + 1152^2 .

It is not a de Polignac number, because 51666129 - 2⁷ = 51666001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51666093 and 51666102.

It is not an unprimeable number, because it can be changed into a prime (51666029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2870332 + ... + 2870349.

Almost surely, 2^51666129 is an apocalyptic number.

It is an amenable number.

51666129 is a deficient number, since it is larger than the sum of its proper divisors (22962737).

51666129 is a wasteful number, since it uses less digits than its factorization.

51666129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5740687 (or 5740684 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 51666129 is about 7187.9154836434. The cubic root of 51666129 is about 372.4505683396.

The spelling of 51666129 in words is "fifty-one million, six hundred sixty-six thousand, one hundred twenty-nine".