20102330663665 has 16 divisors (see below), whose sum is σ = 24578218962000. Its totient is φ = 15778256545792.

The previous prime is 20102330663659. The next prime is 20102330663717. The reversal of 20102330663665 is 56636603320102.

It can be written as a sum of positive squares in 8 ways, for example, as 1334651083441 + 18767679580224 = 1155271^2 + 4332168^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102330663665 - 2¹⁵ = 20102330630897 is a prime.

It is a super-2 number, since 2×20102330663665² (a number of 27 digits) contains 22 as substring.

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, 26520861 + ... + 27268309.

It is an arithmetic number, because the mean of its divisors is an integer number (1536138685125).

Almost surely, 2^{20102330663665} is an apocalyptic number.

It is an amenable number.

20102330663665 is a deficient number, since it is larger than the sum of its proper divisors (4475888298335).

20102330663665 is a wasteful number, since it uses less digits than its factorization.

20102330663665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848996.

The product of its (nonzero) digits is 699840, while the sum is 43.

Adding to 20102330663665 its reverse (56636603320102), we get a palindrome (76738933983767).

The spelling of 20102330663665 in words is "twenty trillion, one hundred two billion, three hundred thirty million, six hundred sixty-three thousand, six hundred sixty-five".