2780077145556 has 96 divisors (see below), whose sum is σ = 6819744798720. Its totient is φ = 879745071744.

The previous prime is 2780077145543. The next prime is 2780077145567. The reversal of 2780077145556 is 6555417700872.

It is a junction number, because it is equal to n+sod(n) for n = 2780077145496 and 2780077145505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144507570 + ... + 144526806.

It is an arithmetic number, because the mean of its divisors is an integer number (71039008320).

Almost surely, 2^{2780077145556} 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 2780077145556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3409872399360).

2780077145556 is an abundant number, since it is smaller than the sum of its proper divisors (4039667653164).

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

2780077145556 is a wasteful number, since it uses less digits than its factorization.

2780077145556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23173 (or 23171 counting only the distinct ones).

The product of its (nonzero) digits is 16464000, while the sum is 57.

The spelling of 2780077145556 in words is "two trillion, seven hundred eighty billion, seventy-seven million, one hundred forty-five thousand, five hundred fifty-six".