51663081 has 16 divisors (see below), whose sum is σ = 72765440. Its totient is φ = 32553360.

The previous prime is 51663047. The next prime is 51663089. The reversal of 51663081 is 18036615.

It is not a de Polignac number, because 51663081 - 2¹⁰ = 51662057 is a prime.

It is a super-2 number, since 2×51663081² = 5338147876825122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51663089) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2461 + ... + 10458.

It is an arithmetic number, because the mean of its divisors is an integer number (4547840).

Almost surely, 2^51663081 is an apocalyptic number.

It is an amenable number.

51663081 is a deficient number, since it is larger than the sum of its proper divisors (21102359).

51663081 is a wasteful number, since it uses less digits than its factorization.

51663081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12996.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51663081 is about 7187.7034579899. The cubic root of 51663081 is about 372.4432440592.

Adding to 51663081 its reverse (18036615), we get a palindrome (69699696).

The spelling of 51663081 in words is "fifty-one million, six hundred sixty-three thousand, eighty-one".