20066755557556 has 6 divisors (see below), whose sum is σ = 35116822225730. Its totient is φ = 10033377778776.

The previous prime is 20066755557491. The next prime is 20066755557577. The reversal of 20066755557556 is 65575555766002.

It can be written as a sum of positive squares in only one way, i.e., 18953658816400 + 1113096741156 = 4353580^2 + 1055034^2 .

It is a super-2 number, since 2×20066755557556² (a number of 27 digits) contains 22 as substring.

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, 2508344444691 + ... + 2508344444698.

Almost surely, 2^{20066755557556} is an apocalyptic number.

It is an amenable number.

20066755557556 is a deficient number, since it is larger than the sum of its proper divisors (15050066668174).

20066755557556 is a wasteful number, since it uses less digits than its factorization.

20066755557556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016688889393 (or 5016688889391 counting only the distinct ones).

The product of its (nonzero) digits is 330750000, while the sum is 64.

The spelling of 20066755557556 in words is "twenty trillion, sixty-six billion, seven hundred fifty-five million, five hundred fifty-seven thousand, five hundred fifty-six".