51903645012 has 18 divisors (see below), whose sum is σ = 131200880538. Its totient is φ = 17301214992.

The previous prime is 51903644987. The next prime is 51903645071. The reversal of 51903645012 is 21054630915.

51903645012 is a `hidden beast` number, since 5 + 1 + 9 + 0 + 3 + 645 + 0 + 1 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 48617604036 + 3286040976 = 220494^2 + 57324^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1441767917 = 51903645012 / (5 + 1 + 9 + 0 + 3 + 6 + 4 + 5 + 0 + 1 + 2).

It is a congruent number.

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, 720883923 + ... + 720883994.

Almost surely, 2^51903645012 is an apocalyptic number.

It is an amenable number.

51903645012 is an abundant number, since it is smaller than the sum of its proper divisors (79297235526).

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

51903645012 is a wasteful number, since it uses less digits than its factorization.

51903645012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441767927 (or 1441767922 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 51903645012 in words is "fifty-one billion, nine hundred three million, six hundred forty-five thousand, twelve".