51445663 has 4 divisors (see below), whose sum is σ = 51955128. Its totient is φ = 50936200.

The previous prime is 51445661. The next prime is 51445703. The reversal of 51445663 is 36654415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51445663 - 2¹ = 51445661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254581 + ... + 254782.

It is an arithmetic number, because the mean of its divisors is an integer number (12988782).

Almost surely, 2^51445663 is an apocalyptic number.

51445663 is a deficient number, since it is larger than the sum of its proper divisors (509465).

51445663 is a wasteful number, since it uses less digits than its factorization.

51445663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509464.

The product of its digits is 43200, while the sum is 34.

The square root of 51445663 is about 7172.5632098992. The cubic root of 51445663 is about 371.9200482395.

The spelling of 51445663 in words is "fifty-one million, four hundred forty-five thousand, six hundred sixty-three".