51399711220 has 96 divisors (see below), whose sum is σ = 126897757056. Its totient is φ = 17241100800.

The previous prime is 51399711211. The next prime is 51399711229. The reversal of 51399711220 is 2211799315.

It is an interprime number because it is at equal distance from previous prime (51399711211) and next prime (51399711229).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51399711229) 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, 4762230 + ... + 4773010.

It is an arithmetic number, because the mean of its divisors is an integer number (1321851636).

Almost surely, 2^51399711220 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 51399711220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63448878528).

51399711220 is an abundant number, since it is smaller than the sum of its proper divisors (75498045836).

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

51399711220 is a wasteful number, since it uses less digits than its factorization.

51399711220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12481 (or 12479 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 40.

The spelling of 51399711220 in words is "fifty-one billion, three hundred ninety-nine million, seven hundred eleven thousand, two hundred twenty".