51550143420 has 24 divisors (see below), whose sum is σ = 144340401744. Its totient is φ = 13746704896.

The previous prime is 51550143389. The next prime is 51550143427. The reversal of 51550143420 is 2434105515.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550143427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 429584469 + ... + 429584588.

It is an arithmetic number, because the mean of its divisors is an integer number (6014183406).

Almost surely, 2^51550143420 is an apocalyptic number.

It is an amenable number.

51550143420 is an abundant number, since it is smaller than the sum of its proper divisors (92790258324).

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

51550143420 is a wasteful number, since it uses less digits than its factorization.

51550143420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859169069 (or 859169067 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 51550143420 its reverse (2434105515), we get a palindrome (53984248935).

The spelling of 51550143420 in words is "fifty-one billion, five hundred fifty million, one hundred forty-three thousand, four hundred twenty".