2778370855920 has 1440 divisors, whose sum is σ = 11295804611520. Its totient is φ = 604761292800.

The previous prime is 2778370855919. The next prime is 2778370855927. The reversal of 2778370855920 is 295580738772.

2778370855920 is a `hidden beast` number, since 2 + 7 + 7 + 8 + 3 + 70 + 8 + 559 + 2 + 0 = 666.

It is a super-2 number, since 2×2778370855920² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778370855927) 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 287 ways as a sum of consecutive naturals, for example, 14103405262 + ... + 14103405458.

It is an arithmetic number, because the mean of its divisors is an integer number (7844308758).

Almost surely, 2^{2778370855920} is an apocalyptic number.

2778370855920 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 2778370855920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5647902305760).

2778370855920 is an abundant number, since it is smaller than the sum of its proper divisors (8517433755600).

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

2778370855920 is a wasteful number, since it uses less digits than its factorization.

2778370855920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 59270400, while the sum is 63.

The spelling of 2778370855920 in words is "two trillion, seven hundred seventy-eight billion, three hundred seventy million, eight hundred fifty-five thousand, nine hundred twenty".