2105620665556 has 12 divisors (see below), whose sum is σ = 3803701847680. Its totient is φ = 1018848709080.

The previous prime is 2105620665521. The next prime is 2105620665679. The reversal of 2105620665556 is 6555660265012.

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, 8490405786 + ... + 8490406033.

Almost surely, 2^{2105620665556} is an apocalyptic number.

It is an amenable number.

2105620665556 is a deficient number, since it is larger than the sum of its proper divisors (1698081182124).

2105620665556 is a wasteful number, since it uses less digits than its factorization.

2105620665556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16980811854 (or 16980811852 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 2105620665556 in words is "two trillion, one hundred five billion, six hundred twenty million, six hundred sixty-five thousand, five hundred fifty-six".