51506663 has 8 divisors (see below), whose sum is σ = 58388400. Its totient is φ = 45042048.

The previous prime is 51506659. The next prime is 51506669. The reversal of 51506663 is 36660515.

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

It is a cyclic number.

It is not a de Polignac number, because 51506663 - 2² = 51506659 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 (51506669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104018 + ... + 104511.

It is an arithmetic number, because the mean of its divisors is an integer number (7298550).

Almost surely, 2^51506663 is an apocalyptic number.

51506663 is a deficient number, since it is larger than the sum of its proper divisors (6881737).

51506663 is a wasteful number, since it uses less digits than its factorization.

51506663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208561.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 51506663 is about 7176.8142653966. The cubic root of 51506663 is about 372.0669874934.

The spelling of 51506663 in words is "fifty-one million, five hundred six thousand, six hundred sixty-three".