2780783075556 has 72 divisors (see below), whose sum is σ = 7164675665784. Its totient is φ = 909149091840.

The previous prime is 2780783075537. The next prime is 2780783075569. The reversal of 2780783075556 is 6555703870872.

2780783075556 is a `hidden beast` number, since 2 + 7 + 8 + 0 + 7 + 8 + 3 + 0 + 75 + 556 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 495292212900 + 2285490862656 = 703770^2 + 1511784^2 .

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2780783075493 and 2780783075502.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1018431 + ... + 2568806.

It is an arithmetic number, because the mean of its divisors is an integer number (99509384247).

Almost surely, 2^{2780783075556} is an apocalyptic number.

It is an amenable number.

2780783075556 is an abundant number, since it is smaller than the sum of its proper divisors (4383892590228).

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

2780783075556 is a wasteful number, since it uses less digits than its factorization.

2780783075556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587661 (or 3587656 counting only the distinct ones).

The product of its (nonzero) digits is 98784000, while the sum is 63.

The spelling of 2780783075556 in words is "two trillion, seven hundred eighty billion, seven hundred eighty-three million, seventy-five thousand, five hundred fifty-six".