20665365415 has 16 divisors (see below), whose sum is σ = 25294363776. Its totient is φ = 16202368000.

The previous prime is 20665365407. The next prime is 20665365437. The reversal of 20665365415 is 51456356602.

It is not a de Polignac number, because 20665365415 - 2³ = 20665365407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198615 + ... + 284215.

It is an arithmetic number, because the mean of its divisors is an integer number (1580897736).

Almost surely, 2^20665365415 is an apocalyptic number.

20665365415 is a deficient number, since it is larger than the sum of its proper divisors (4628998361).

20665365415 is an equidigital number, since it uses as much as digits as its factorization.

20665365415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86570.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 20665365415 in words is "twenty billion, six hundred sixty-five million, three hundred sixty-five thousand, four hundred fifteen".