51666500 has 24 divisors (see below), whose sum is σ = 112840728. Its totient is φ = 20666400.

The previous prime is 51666499. The next prime is 51666539. The reversal of 51666500 is 566615.

It can be written as a sum of positive squares in 4 ways, for example, as 56644 + 51609856 = 238^2 + 7184^2 .

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 7 ways as a sum of consecutive naturals, for example, 51167 + ... + 52166.

It is an arithmetic number, because the mean of its divisors is an integer number (4701697).

Almost surely, 2^51666500 is an apocalyptic number.

51666500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51666500 is an abundant number, since it is smaller than the sum of its proper divisors (61174228).

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

51666500 is a wasteful number, since it uses less digits than its factorization.

51666500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103352 (or 103340 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 51666500 is about 7187.9412908009. The cubic root of 51666500 is about 372.4514598252.

The spelling of 51666500 in words is "fifty-one million, six hundred sixty-six thousand, five hundred".