2223778617720 has 768 divisors, whose sum is σ = 8656187904000. Its totient is φ = 489104179200.

The previous prime is 2223778617661. The next prime is 2223778617737. The reversal of 2223778617720 is 277168773222.

2223778617720 is a `hidden beast` number, since 2 + 2 + 2 + 377 + 86 + 177 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 226241766 + ... + 226251594.

It is an arithmetic number, because the mean of its divisors is an integer number (11271078000).

Almost surely, 2^{2223778617720} is an apocalyptic number.

2223778617720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2223778617720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4328093952000).

2223778617720 is an abundant number, since it is smaller than the sum of its proper divisors (6432409286280).

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

2223778617720 is a wasteful number, since it uses less digits than its factorization.

2223778617720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10004 (or 9997 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 54.

The spelling of 2223778617720 in words is "two trillion, two hundred twenty-three billion, seven hundred seventy-eight million, six hundred seventeen thousand, seven hundred twenty".