51006663 has 24 divisors (see below), whose sum is σ = 77276160. Its totient is φ = 32358480.

The previous prime is 51006661. The next prime is 51006667. The reversal of 51006663 is 36660015.

It is not a de Polignac number, because 51006663 - 2¹ = 51006661 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51006661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48958 + ... + 49988.

It is an arithmetic number, because the mean of its divisors is an integer number (3219840).

Almost surely, 2^51006663 is an apocalyptic number.

51006663 is a deficient number, since it is larger than the sum of its proper divisors (26269497).

51006663 is a wasteful number, since it uses less digits than its factorization.

51006663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 51006663 is about 7141.8949166170. The cubic root of 51006663 is about 370.8591260714.

Adding to 51006663 its reverse (36660015), we get a palindrome (87666678).

The spelling of 51006663 in words is "fifty-one million, six thousand, six hundred sixty-three".