51666120 has 128 divisors (see below), whose sum is σ = 187920000. Its totient is φ = 12522240.

The previous prime is 51666103. The next prime is 51666137. The reversal of 51666120 is 2166615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51666103) and next prime (51666137).

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 9706 + ... + 14054.

It is an arithmetic number, because the mean of its divisors is an integer number (1468125).

Almost surely, 2^51666120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51666120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93960000).

51666120 is an abundant number, since it is smaller than the sum of its proper divisors (136253880).

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

51666120 is a wasteful number, since it uses less digits than its factorization.

51666120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380 (or 4370 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 51666120 is about 7187.9148575926. The cubic root of 51666120 is about 372.4505467132.

The spelling of 51666120 in words is "fifty-one million, six hundred sixty-six thousand, one hundred twenty".