51660188 has 12 divisors (see below), whose sum is σ = 90740832. Its totient is φ = 25734240.

The previous prime is 51660179. The next prime is 51660197. The reversal of 51660188 is 88106615.

It is an interprime number because it is at equal distance from previous prime (51660179) and next prime (51660197).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22745 + ... + 24912.

It is an arithmetic number, because the mean of its divisors is an integer number (7561736).

Almost surely, 2^51660188 is an apocalyptic number.

It is an amenable number.

51660188 is a deficient number, since it is larger than the sum of its proper divisors (39080644).

51660188 is a wasteful number, since it uses less digits than its factorization.

51660188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47932 (or 47930 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 51660188 is about 7187.5022086953. The cubic root of 51660188 is about 372.4362919740.

The spelling of 51660188 in words is "fifty-one million, six hundred sixty thousand, one hundred eighty-eight".