1666561060 has 24 divisors (see below), whose sum is σ = 3683977920. Its totient is φ = 631538784.

The previous prime is 1666561033. The next prime is 1666561069. The reversal of 1666561060 is 601656661.

It is not an unprimeable number, because it can be changed into a prime (1666561069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2192464 + ... + 2193223.

It is an arithmetic number, because the mean of its divisors is an integer number (153499080).

Almost surely, 2^1666561060 is an apocalyptic number.

1666561060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666561060 is an abundant number, since it is smaller than the sum of its proper divisors (2017416860).

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

1666561060 is a wasteful number, since it uses less digits than its factorization.

1666561060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385715 (or 4385713 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1666561060 is about 40823.5356136629. The cubic root of 1666561060 is about 1185.6060588580.

The spelling of 1666561060 in words is "one billion, six hundred sixty-six million, five hundred sixty-one thousand, sixty".