51947421696 has 540 divisors, whose sum is σ = 169481933712. Its totient is φ = 15294529536.

The previous prime is 51947421661. The next prime is 51947421707. The reversal of 51947421696 is 69612474915.

51947421696 is a `hidden beast` number, since 5 + 1 + 9 + 474 + 2 + 169 + 6 = 666.

Its product of digits (3265920) is a multiple of the sum of its prime factors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 980140006 + ... + 980140058.

Almost surely, 2^51947421696 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 51947421696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84740966856).

51947421696 is an abundant number, since it is smaller than the sum of its proper divisors (117534512016).

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

51947421696 is a wasteful number, since it uses less digits than its factorization.

51947421696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 98 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 51947421696 in words is "fifty-one billion, nine hundred forty-seven million, four hundred twenty-one thousand, six hundred ninety-six".