51497865120 has 192 divisors, whose sum is σ = 175120493184. Its totient is φ = 12645642240.

The previous prime is 51497865109. The next prime is 51497865187. The reversal of 51497865120 is 2156879415.

It is a happy number.

It is a super-2 number, since 2×51497865120² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 51497865120.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2617239 + ... + 2636841.

It is an arithmetic number, because the mean of its divisors is an integer number (912085902).

Almost surely, 2^51497865120 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 51497865120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87560246592).

51497865120 is an abundant number, since it is smaller than the sum of its proper divisors (123622628064).

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

51497865120 is a wasteful number, since it uses less digits than its factorization.

51497865120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20055 (or 20047 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 51497865120 in words is "fifty-one billion, four hundred ninety-seven million, eight hundred sixty-five thousand, one hundred twenty".