51666776 has 64 divisors (see below), whose sum is σ = 119040000. Its totient is φ = 20956320.

The previous prime is 51666773. The next prime is 51666787. The reversal of 51666776 is 67766615.

51666776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666773) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 51641 + ... + 52631.

It is an arithmetic number, because the mean of its divisors is an integer number (1860000).

Almost surely, 2^51666776 is an apocalyptic number.

51666776 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51666776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59520000).

51666776 is an abundant number, since it is smaller than the sum of its proper divisors (67373224).

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

51666776 is a wasteful number, since it uses less digits than its factorization.

51666776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1019 counting only the distinct ones).

The product of its digits is 317520, while the sum is 44.

The square root of 51666776 is about 7187.9604895965. The cubic root of 51666776 is about 372.4521230301.

The spelling of 51666776 in words is "fifty-one million, six hundred sixty-six thousand, seven hundred seventy-six".