51273645120 has 336 divisors, whose sum is σ = 178574273280. Its totient is φ = 13502619648.

The previous prime is 51273645113. The next prime is 51273645127. The reversal of 51273645120 is 2154637215.

51273645120 is a `hidden beast` number, since 5 + 1 + 2 + 7 + 3 + 645 + 1 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51273645113) and next prime (51273645127).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51273645127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112195932 + ... + 112196388.

Almost surely, 2^51273645120 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 51273645120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89287136640).

51273645120 is an abundant number, since it is smaller than the sum of its proper divisors (127300628160).

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

51273645120 is a wasteful number, since it uses less digits than its factorization.

51273645120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 51273645120 in words is "fifty-one billion, two hundred seventy-three million, six hundred forty-five thousand, one hundred twenty".