20561553546102 has 64 divisors (see below), whose sum is σ = 47537676288000. Its totient is φ = 6580532689920.

The previous prime is 20561553546097. The next prime is 20561553546161. The reversal of 20561553546102 is 20164535516502.

20561553546102 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 1 + 5 + 535 + 4 + 6 + 102 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48145227 + ... + 48570422.

It is an arithmetic number, because the mean of its divisors is an integer number (742776192000).

Almost surely, 2^{20561553546102} is an apocalyptic number.

20561553546102 is an abundant number, since it is smaller than the sum of its proper divisors (26976122741898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20561553546102 is a wasteful number, since it uses less digits than its factorization.

20561553546102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96715818 (or 96715812 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 20561553546102 in words is "twenty trillion, five hundred sixty-one billion, five hundred fifty-three million, five hundred forty-six thousand, one hundred two".