51631006220 has 96 divisors (see below), whose sum is σ = 114916838400. Its totient is φ = 19431360000.

The previous prime is 51631006183. The next prime is 51631006319. The reversal of 51631006220 is 2260013615.

It is a self number, because there is not a number n which added to its sum of digits gives 51631006220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49692461 + ... + 49693499.

It is an arithmetic number, because the mean of its divisors is an integer number (1197050400).

Almost surely, 2^51631006220 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 51631006220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57458419200).

51631006220 is an abundant number, since it is smaller than the sum of its proper divisors (63285832180).

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

51631006220 is a wasteful number, since it uses less digits than its factorization.

51631006220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839 (or 1837 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 51631006220 its reverse (2260013615), we get a palindrome (53891019835).

The spelling of 51631006220 in words is "fifty-one billion, six hundred thirty-one million, six thousand, two hundred twenty".