51166660 has 12 divisors (see below), whose sum is σ = 107450028. Its totient is φ = 20466656.

The previous prime is 51166657. The next prime is 51166663. The reversal of 51166660 is 6666115.

51166660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51166657) and next prime (51166663).

It can be written as a sum of positive squares in 2 ways, for example, as 11451456 + 39715204 = 3384^2 + 6302^2 .

It is not an unprimeable number, because it can be changed into a prime (51166663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279147 + ... + 1279186.

It is an arithmetic number, because the mean of its divisors is an integer number (8954169).

Almost surely, 2^51166660 is an apocalyptic number.

It is an amenable number.

51166660 is an abundant number, since it is smaller than the sum of its proper divisors (56283368).

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

51166660 is a wasteful number, since it uses less digits than its factorization.

51166660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558342 (or 2558340 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51166660 is about 7153.0874452924. The cubic root of 51166660 is about 371.2464899319.

The spelling of 51166660 in words is "fifty-one million, one hundred sixty-six thousand, six hundred sixty".