51653935872 has 1080 divisors, whose sum is σ = 206048592288. Its totient is φ = 12554403840.

The previous prime is 51653935849. The next prime is 51653935873. The reversal of 51653935872 is 27853935615.

51653935872 is a `hidden beast` number, since 5 + 1 + 6 + 53 + 9 + 3 + 587 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (51653935873) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 298577578 + ... + 298577750.

Almost surely, 2^51653935872 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 51653935872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103024296144).

51653935872 is an abundant number, since it is smaller than the sum of its proper divisors (154394656416).

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

51653935872 is a wasteful number, since it uses less digits than its factorization.

51653935872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 213 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 54.

The spelling of 51653935872 in words is "fifty-one billion, six hundred fifty-three million, nine hundred thirty-five thousand, eight hundred seventy-two".