51311332550 has 48 divisors (see below), whose sum is σ = 102357801360. Its totient is φ = 19077402240.

The previous prime is 51311332547. The next prime is 51311332561. The reversal of 51311332550 is 5523311315.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 459197 + ... + 559896.

It is an arithmetic number, because the mean of its divisors is an integer number (2132454195).

Almost surely, 2^51311332550 is an apocalyptic number.

51311332550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51311332550 is a deficient number, since it is larger than the sum of its proper divisors (51046468810).

51311332550 is a wasteful number, since it uses less digits than its factorization.

51311332550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019177 (or 1019172 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 29.

Adding to 51311332550 its reverse (5523311315), we get a palindrome (56834643865).

The spelling of 51311332550 in words is "fifty-one billion, three hundred eleven million, three hundred thirty-two thousand, five hundred fifty".