51996249648 has 360 divisors, whose sum is σ = 179310523392. Its totient is φ = 14537480832.

The previous prime is 51996249647. The next prime is 51996249727. The reversal of 51996249648 is 84694269915.

51996249648 is a `hidden beast` number, since 5 + 19 + 96 + 2 + 496 + 48 = 666.

51996249648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (51996249647) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8951161 + ... + 8956967.

Almost surely, 2^51996249648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51996249648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89655261696).

51996249648 is an abundant number, since it is smaller than the sum of its proper divisors (127314273744).

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

51996249648 is a wasteful number, since it uses less digits than its factorization.

51996249648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5891 (or 5866 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The spelling of 51996249648 in words is "fifty-one billion, nine hundred ninety-six million, two hundred forty-nine thousand, six hundred forty-eight".