21650093665 has 8 divisors (see below), whose sum is σ = 26613773928. Its totient is φ = 16897633920.

The previous prime is 21650093659. The next prime is 21650093737. The reversal of 21650093665 is 56639005612.

It can be written as a sum of positive squares in 4 ways, for example, as 385454689 + 21264638976 = 19633^2 + 145824^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21650093665 - 2¹³ = 21650085473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52804902 + ... + 52805311.

It is an arithmetic number, because the mean of its divisors is an integer number (3326721741).

Almost surely, 2^21650093665 is an apocalyptic number.

It is an amenable number.

21650093665 is a deficient number, since it is larger than the sum of its proper divisors (4963680263).

21650093665 is a wasteful number, since it uses less digits than its factorization.

21650093665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105610259.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 21650093665 in words is "twenty-one billion, six hundred fifty million, ninety-three thousand, six hundred sixty-five".