51666650 has 48 divisors (see below), whose sum is σ = 112415424. Its totient is φ = 17297280.

The previous prime is 51666649. The next prime is 51666707. The reversal of 51666650 is 5666615.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51666650.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13334 + ... + 16766.

It is an arithmetic number, because the mean of its divisors is an integer number (2341988).

Almost surely, 2^51666650 is an apocalyptic number.

51666650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51666650 is an abundant number, since it is smaller than the sum of its proper divisors (60748774).

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

51666650 is a wasteful number, since it uses less digits than its factorization.

51666650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495 (or 3490 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 51666650 is about 7187.9517249353. The cubic root of 51666650 is about 372.4518202629.

Subtracting from 51666650 its sum of digits (35), we obtain a palindrome (51666615).

The spelling of 51666650 in words is "fifty-one million, six hundred sixty-six thousand, six hundred fifty".