20666333515 has 8 divisors (see below), whose sum is σ = 25404468768. Its totient is φ = 16129821120.

The previous prime is 20666333503. The next prime is 20666333521. The reversal of 20666333515 is 51533366602.

It is a happy number.

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

It is not a de Polignac number, because 20666333515 - 2¹¹ = 20666331467 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, 50405487 + ... + 50405896.

It is an arithmetic number, because the mean of its divisors is an integer number (3175558596).

Almost surely, 2^20666333515 is an apocalyptic number.

20666333515 is a deficient number, since it is larger than the sum of its proper divisors (4738135253).

20666333515 is a wasteful number, since it uses less digits than its factorization.

20666333515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100811429.

The product of its (nonzero) digits is 291600, while the sum is 40.

The spelling of 20666333515 in words is "twenty billion, six hundred sixty-six million, three hundred thirty-three thousand, five hundred fifteen".