1666540860 has 48 divisors (see below), whose sum is σ = 4668260352. Its totient is φ = 444225600.

The previous prime is 1666540853. The next prime is 1666540867. The reversal of 1666540860 is 680456661.

It is an interprime number because it is at equal distance from previous prime (1666540853) and next prime (1666540867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666540867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199365 + ... + 207555.

It is an arithmetic number, because the mean of its divisors is an integer number (97255424).

Almost surely, 2^1666540860 is an apocalyptic number.

1666540860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666540860 is an abundant number, since it is smaller than the sum of its proper divisors (3001719492).

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

1666540860 is a wasteful number, since it uses less digits than its factorization.

1666540860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11594 (or 11592 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 1666540860 is about 40823.2882066107. The cubic root of 1666540860 is about 1185.6012686867.

The spelling of 1666540860 in words is "one billion, six hundred sixty-six million, five hundred forty thousand, eight hundred sixty".