51942357720 has 192 divisors, whose sum is σ = 184263206400. Its totient is φ = 12584981760.

The previous prime is 51942357683. The next prime is 51942357743. The reversal of 51942357720 is 2775324915.

It is a happy number.

51942357720 is a `hidden beast` number, since 5 + 19 + 42 + 3 + 577 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11636209 + ... + 11640671.

It is an arithmetic number, because the mean of its divisors is an integer number (959704200).

Almost surely, 2^51942357720 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 51942357720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92131603200).

51942357720 is an abundant number, since it is smaller than the sum of its proper divisors (132320848680).

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

51942357720 is a wasteful number, since it uses less digits than its factorization.

51942357720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7430 (or 7423 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 51942357720 in words is "fifty-one billion, nine hundred forty-two million, three hundred fifty-seven thousand, seven hundred twenty".