51550042212 has 18 divisors (see below), whose sum is σ = 130307051238. Its totient is φ = 17183347392.

The previous prime is 51550042189. The next prime is 51550042237. The reversal of 51550042212 is 21224005515.

51550042212 is a `hidden beast` number, since 51 + 550 + 0 + 42 + 21 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50830407936 + 719634276 = 225456^2 + 26826^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 715972773 + ... + 715972844.

Almost surely, 2^51550042212 is an apocalyptic number.

It is an amenable number.

51550042212 is an abundant number, since it is smaller than the sum of its proper divisors (78757009026).

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

51550042212 is a wasteful number, since it uses less digits than its factorization.

51550042212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431945627 (or 1431945622 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 51550042212 its reverse (21224005515), we get a palindrome (72774047727).

The spelling of 51550042212 in words is "fifty-one billion, five hundred fifty million, forty-two thousand, two hundred twelve".