51550213440 has 112 divisors (see below), whose sum is σ = 178551230400. Its totient is φ = 12497018880.

The previous prime is 51550213433. The next prime is 51550213493. The reversal of 51550213440 is 4431205515.

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

It is a junction number, because it is equal to n+sod(n) for n = 51550213398 and 51550213407.

It is a congruent number.

It is an unprimeable number.

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, 2430265 + ... + 2451384.

Almost surely, 2^51550213440 is an apocalyptic number.

It is an amenable number.

51550213440 is an abundant number, since it is smaller than the sum of its proper divisors (127001016960).

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

51550213440 is a wasteful number, since it uses less digits than its factorization.

51550213440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4881680 (or 4881670 counting only the distinct ones).

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

Adding to 51550213440 its reverse (4431205515), we get a palindrome (55981418955).

The spelling of 51550213440 in words is "fifty-one billion, five hundred fifty million, two hundred thirteen thousand, four hundred forty".