51660447 has 8 divisors (see below), whose sum is σ = 68920320. Its totient is φ = 34420440.

The previous prime is 51660443. The next prime is 51660463. The reversal of 51660447 is 74406615.

51660447 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 51660447 - 2² = 51660443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660443) 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, 2872 + ... + 10562.

It is an arithmetic number, because the mean of its divisors is an integer number (8615040).

Almost surely, 2^51660447 is an apocalyptic number.

51660447 is a deficient number, since it is larger than the sum of its proper divisors (17259873).

51660447 is a wasteful number, since it uses less digits than its factorization.

51660447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9933.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 51660447 is about 7187.5202260585. The cubic root of 51660447 is about 372.4369143800.

The spelling of 51660447 in words is "fifty-one million, six hundred sixty thousand, four hundred forty-seven".