51649536012 has 12 divisors (see below), whose sum is σ = 120515584056. Its totient is φ = 17216512000.

The previous prime is 51649535933. The next prime is 51649536013. The reversal of 51649536012 is 21063594615.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51649536013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152063989 + ... + 2152064012.

It is an arithmetic number, because the mean of its divisors is an integer number (10042965338).

Almost surely, 2^51649536012 is an apocalyptic number.

It is an amenable number.

51649536012 is an abundant number, since it is smaller than the sum of its proper divisors (68866048044).

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

51649536012 is a wasteful number, since it uses less digits than its factorization.

51649536012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304128008 (or 4304128006 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 51649536012 in words is "fifty-one billion, six hundred forty-nine million, five hundred thirty-six thousand, twelve".