2780365405556 has 12 divisors (see below), whose sum is σ = 4873735369860. Its totient is φ = 1387869585600.

The previous prime is 2780365405547. The next prime is 2780365405577. The reversal of 2780365405556 is 6555045630872.

It can be written as a sum of positive squares in 2 ways, for example, as 2554850592100 + 225514813456 = 1598390^2 + 474884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578276591 + ... + 578281398.

It is an arithmetic number, because the mean of its divisors is an integer number (406144614155).

Almost surely, 2^{2780365405556} is an apocalyptic number.

It is an amenable number.

2780365405556 is a deficient number, since it is larger than the sum of its proper divisors (2093369964304).

2780365405556 is a wasteful number, since it uses less digits than its factorization.

2780365405556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156558594 (or 1156558592 counting only the distinct ones).

The product of its (nonzero) digits is 30240000, while the sum is 56.

The spelling of 2780365405556 in words is "two trillion, seven hundred eighty billion, three hundred sixty-five million, four hundred five thousand, five hundred fifty-six".