20564212661066 has 24 divisors (see below), whose sum is σ = 32772836366316. Its totient is φ = 9675713254400.

The previous prime is 20564212661029. The next prime is 20564212661087. The reversal of 20564212661066 is 66016621246502.

It can be written as a sum of positive squares in 6 ways, for example, as 17388941700025 + 3175270961041 = 4170005^2 + 1781929^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20564212661066.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 711266 + ... + 6452466.

Almost surely, 2^{20564212661066} is an apocalyptic number.

20564212661066 is a deficient number, since it is larger than the sum of its proper divisors (12208623705250).

20564212661066 is a wasteful number, since it uses less digits than its factorization.

20564212661066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5747434 (or 5747417 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 20564212661066 in words is "twenty trillion, five hundred sixty-four billion, two hundred twelve million, six hundred sixty-one thousand, sixty-six".