51778222020 has 288 divisors, whose sum is σ = 189405216000. Its totient is φ = 11184832512.

The previous prime is 51778222003. The next prime is 51778222033. The reversal of 51778222020 is 2022287715.

51778222020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10746652 + ... + 10751468.

It is an arithmetic number, because the mean of its divisors is an integer number (657657000).

Almost surely, 2^51778222020 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 51778222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94702608000).

51778222020 is an abundant number, since it is smaller than the sum of its proper divisors (137626993980).

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

51778222020 is a wasteful number, since it uses less digits than its factorization.

51778222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5307 (or 5302 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The spelling of 51778222020 in words is "fifty-one billion, seven hundred seventy-eight million, two hundred twenty-two thousand, twenty".