20106661655511 has 12 divisors (see below), whose sum is σ = 29190381898392. Its totient is φ = 13336398254256.

The previous prime is 20106661655489. The next prime is 20106661655533. The reversal of 20106661655511 is 11555616660102.

It is an interprime number because it is at equal distance from previous prime (20106661655489) and next prime (20106661655533).

It is not a de Polignac number, because 20106661655511 - 2⁹ = 20106661654999 is a prime.

It is a super-2 number, since 2×20106661655511² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20106661655911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5670235581 + ... + 5670239126.

It is an arithmetic number, because the mean of its divisors is an integer number (2432531824866).

Almost surely, 2^{20106661655511} is an apocalyptic number.

20106661655511 is a deficient number, since it is larger than the sum of its proper divisors (9083720242881).

20106661655511 is a wasteful number, since it uses less digits than its factorization.

20106661655511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11340474910 (or 11340474907 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 20106661655511 in words is "twenty trillion, one hundred six billion, six hundred sixty-one million, six hundred fifty-five thousand, five hundred eleven".