51405663 has 8 divisors (see below), whose sum is σ = 69081088. Its totient is φ = 34000344.

The previous prime is 51405647. The next prime is 51405701. The reversal of 51405663 is 36650415.

51405663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51405663 - 2⁴ = 51405647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51405663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51405623) 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 7 ways as a sum of consecutive naturals, for example, 67081 + ... + 67842.

It is an arithmetic number, because the mean of its divisors is an integer number (8635136).

Almost surely, 2^51405663 is an apocalyptic number.

51405663 is a deficient number, since it is larger than the sum of its proper divisors (17675425).

51405663 is a wasteful number, since it uses less digits than its factorization.

51405663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135053.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 51405663 is about 7169.7742642290. The cubic root of 51405663 is about 371.8236315648.

The spelling of 51405663 in words is "fifty-one million, four hundred five thousand, six hundred sixty-three".