20151666115 has 8 divisors (see below), whose sum is σ = 27636570720. Its totient is φ = 13818285312.

The previous prime is 20151666113. The next prime is 20151666121. The reversal of 20151666115 is 51166615102.

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

It is a cyclic number.

It is not a de Polignac number, because 20151666115 - 2¹ = 20151666113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20151666113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287880910 + ... + 287880979.

It is an arithmetic number, because the mean of its divisors is an integer number (3454571340).

Almost surely, 2^20151666115 is an apocalyptic number.

20151666115 is a deficient number, since it is larger than the sum of its proper divisors (7484904605).

20151666115 is an equidigital number, since it uses as much as digits as its factorization.

20151666115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575761901.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 20151666115 in words is "twenty billion, one hundred fifty-one million, six hundred sixty-six thousand, one hundred fifteen".