2105656345556 has 6 divisors (see below), whose sum is σ = 3684898604730. Its totient is φ = 1052828172776.

The previous prime is 2105656345537. The next prime is 2105656345567. The reversal of 2105656345556 is 6555436565012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1720598864656 + 385057480900 = 1311716^2 + 620530^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2105656345498 and 2105656345507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263207043191 + ... + 263207043198.

It is an arithmetic number, because the mean of its divisors is an integer number (614149767455).

Almost surely, 2^{2105656345556} is an apocalyptic number.

It is an amenable number.

2105656345556 is a deficient number, since it is larger than the sum of its proper divisors (1579242259174).

2105656345556 is a wasteful number, since it uses less digits than its factorization.

2105656345556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526414086393 (or 526414086391 counting only the distinct ones).

The product of its (nonzero) digits is 16200000, while the sum is 53.

The spelling of 2105656345556 in words is "two trillion, one hundred five billion, six hundred fifty-six million, three hundred forty-five thousand, five hundred fifty-six".