51663666252 has 96 divisors (see below), whose sum is σ = 133042291200. Its totient is φ = 15473387520.

The previous prime is 51663666203. The next prime is 51663666253. The reversal of 51663666252 is 25266636615.

It is not an unprimeable number, because it can be changed into a prime (51663666253) 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 31 ways as a sum of consecutive naturals, for example, 11354874 + ... + 11359422.

It is an arithmetic number, because the mean of its divisors is an integer number (1385857200).

Almost surely, 2^51663666252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51663666252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66521145600).

51663666252 is an abundant number, since it is smaller than the sum of its proper divisors (81378624948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51663666252 is a wasteful number, since it uses less digits than its factorization.

51663666252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551 (or 5549 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 48.

The spelling of 51663666252 in words is "fifty-one billion, six hundred sixty-three million, six hundred sixty-six thousand, two hundred fifty-two".