1666550115 has 24 divisors (see below), whose sum is σ = 2966762448. Its totient is φ = 864803520.

The previous prime is 1666550099. The next prime is 1666550117. The reversal of 1666550115 is 5110556661.

It is not a de Polignac number, because 1666550115 - 2⁴ = 1666550099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666550115.

It is not an unprimeable number, because it can be changed into a prime (1666550117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 498801 + ... + 502130.

It is an arithmetic number, because the mean of its divisors is an integer number (123615102).

Almost surely, 2^1666550115 is an apocalyptic number.

1666550115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666550115 is a deficient number, since it is larger than the sum of its proper divisors (1300212333).

1666550115 is a wasteful number, since it uses less digits than its factorization.

1666550115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000979 (or 1000976 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1666550115 is about 40823.4015608695. The cubic root of 1666550115 is about 1185.6034633962.

The spelling of 1666550115 in words is "one billion, six hundred sixty-six million, five hundred fifty thousand, one hundred fifteen".