1666500120 has 48 divisors (see below), whose sum is σ = 5416126560. Its totient is φ = 444399936.

The previous prime is 1666500079. The next prime is 1666500161. The reversal of 1666500120 is 210056661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1666500079) and next prime (1666500161).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2314224 + ... + 2314943.

It is an arithmetic number, because the mean of its divisors is an integer number (112835970).

Almost surely, 2^1666500120 is an apocalyptic number.

1666500120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666500120 is an abundant number, since it is smaller than the sum of its proper divisors (3749626440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666500120 is a wasteful number, since it uses less digits than its factorization.

1666500120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629184 (or 4629177 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1666500120 is about 40822.7892236677. The cubic root of 1666500120 is about 1185.5916075996.

Adding to 1666500120 its reverse (210056661), we get a palindrome (1876556781).

The spelling of 1666500120 in words is "one billion, six hundred sixty-six million, five hundred thousand, one hundred twenty".