2066561897908 has 6 divisors (see below), whose sum is σ = 3616483321346. Its totient is φ = 1033280948952.

The previous prime is 2066561897867. The next prime is 2066561897921. The reversal of 2066561897908 is 8097981656602.

It can be written as a sum of positive squares in only one way, i.e., 1877195931664 + 189365966244 = 1370108^2 + 435162^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258320237235 + ... + 258320237242.

Almost surely, 2^{2066561897908} is an apocalyptic number.

It is an amenable number.

2066561897908 is a deficient number, since it is larger than the sum of its proper divisors (1549921423438).

2066561897908 is a wasteful number, since it uses less digits than its factorization.

2066561897908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516640474481 (or 516640474479 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 2066561897908 in words is "two trillion, sixty-six billion, five hundred sixty-one million, eight hundred ninety-seven thousand, nine hundred eight".