20101563656066 has 32 divisors (see below), whose sum is σ = 31210520689920. Its totient is φ = 9702623750400.

The previous prime is 20101563656059. The next prime is 20101563656087. The reversal of 20101563656066 is 66065636510102.

It is a super-2 number, since 2×20101563656066² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20101563656066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2753405 + ... + 6912623.

It is an arithmetic number, because the mean of its divisors is an integer number (975328771560).

Almost surely, 2^{20101563656066} is an apocalyptic number.

20101563656066 is a deficient number, since it is larger than the sum of its proper divisors (11108957033854).

20101563656066 is a wasteful number, since it uses less digits than its factorization.

20101563656066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159770.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 20101563656066 in words is "twenty trillion, one hundred one billion, five hundred sixty-three million, six hundred fifty-six thousand, sixty-six".