51563666 has 48 divisors (see below), whose sum is σ = 98952000. Its totient is φ = 19720800.

The previous prime is 51563627. The next prime is 51563671. The reversal of 51563666 is 66636515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103085 + ... + 103583.

It is an arithmetic number, because the mean of its divisors is an integer number (2061500).

Almost surely, 2^51563666 is an apocalyptic number.

51563666 is a deficient number, since it is larger than the sum of its proper divisors (47388334).

51563666 is a wasteful number, since it uses less digits than its factorization.

51563666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 580 counting only the distinct ones).

The product of its digits is 97200, while the sum is 38.

The square root of 51563666 is about 7180.7844975323. The cubic root of 51563666 is about 372.2041937887.

The spelling of 51563666 in words is "fifty-one million, five hundred sixty-three thousand, six hundred sixty-six".