51666510 has 128 divisors (see below), whose sum is σ = 155934720. Its totient is φ = 10682496.

The previous prime is 51666499. The next prime is 51666539. The reversal of 51666510 is 1566615.

51666510 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 91489 + ... + 92051.

It is an arithmetic number, because the mean of its divisors is an integer number (1218240).

Almost surely, 2^51666510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51666510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77967360).

51666510 is an abundant number, since it is smaller than the sum of its proper divisors (104268210).

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

51666510 is a wasteful number, since it uses less digits than its factorization.

51666510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 51666510 is about 7187.9419864103. The cubic root of 51666510 is about 372.4514838544.

The spelling of 51666510 in words is "fifty-one million, six hundred sixty-six thousand, five hundred ten".