51300256620 has 96 divisors (see below), whose sum is σ = 150245383680. Its totient is φ = 13053905920.

The previous prime is 51300256619. The next prime is 51300256627. The reversal of 51300256620 is 2665200315.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (51300256627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 533860 + ... + 622580.

It is an arithmetic number, because the mean of its divisors is an integer number (1565056080).

Almost surely, 2^51300256620 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 51300256620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75122691840).

51300256620 is an abundant number, since it is smaller than the sum of its proper divisors (98945127060).

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

51300256620 is a wasteful number, since it uses less digits than its factorization.

51300256620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89175 (or 89173 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 51300256620 its reverse (2665200315), we get a palindrome (53965456935).

The spelling of 51300256620 in words is "fifty-one billion, three hundred million, two hundred fifty-six thousand, six hundred twenty".