20665365353 has 4 divisors (see below), whose sum is σ = 20665889280. Its totient is φ = 20664841428.

The previous prime is 20665365317. The next prime is 20665365389. The reversal of 20665365353 is 35356356602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20665365317) and next prime (20665365389).

It is a cyclic number.

It is not a de Polignac number, because 20665365353 - 2¹² = 20665361257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20665364353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197513 + ... + 283446.

It is an arithmetic number, because the mean of its divisors is an integer number (5166472320).

Almost surely, 2^20665365353 is an apocalyptic number.

It is an amenable number.

20665365353 is a deficient number, since it is larger than the sum of its proper divisors (523927).

20665365353 is an equidigital number, since it uses as much as digits as its factorization.

20665365353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523926.

The product of its (nonzero) digits is 1458000, while the sum is 44.

The spelling of 20665365353 in words is "twenty billion, six hundred sixty-five million, three hundred sixty-five thousand, three hundred fifty-three".