51780997120 has 104 divisors (see below), whose sum is σ = 124473057120. Its totient is φ = 20676771840.

The previous prime is 51780997049. The next prime is 51780997201. The reversal of 51780997120 is 2179908715.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14149851 + ... + 14153509.

Almost surely, 2^51780997120 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 51780997120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62236528560).

51780997120 is an abundant number, since it is smaller than the sum of its proper divisors (72692060000).

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

51780997120 is an equidigital number, since it uses as much as digits as its factorization.

51780997120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4379 (or 4357 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 49.

The spelling of 51780997120 in words is "fifty-one billion, seven hundred eighty million, nine hundred ninety-seven thousand, one hundred twenty".