1666500115 has 8 divisors (see below), whose sum is σ = 2285485920. Its totient is φ = 1142742912.

The previous prime is 1666500079. The next prime is 1666500161. The reversal of 1666500115 is 5110056661.

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 1666500115 - 2¹³ = 1666491923 is a prime.

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, 23807110 + ... + 23807179.

It is an arithmetic number, because the mean of its divisors is an integer number (285685740).

Almost surely, 2^1666500115 is an apocalyptic number.

1666500115 is a deficient number, since it is larger than the sum of its proper divisors (618985805).

1666500115 is an equidigital number, since it uses as much as digits as its factorization.

1666500115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47614301.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1666500115 is about 40822.7891624274. The cubic root of 1666500115 is about 1185.5916064139.

Adding to 1666500115 its reverse (5110056661), we get a palindrome (6776556776).

The spelling of 1666500115 in words is "one billion, six hundred sixty-six million, five hundred thousand, one hundred fifteen".