1666011156 has 12 divisors (see below), whose sum is σ = 3887359392. Its totient is φ = 555337048.

The previous prime is 1666011133. The next prime is 1666011157. The reversal of 1666011156 is 6511106661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666011157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69417120 + ... + 69417143.

It is an arithmetic number, because the mean of its divisors is an integer number (323946616).

Almost surely, 2^1666011156 is an apocalyptic number.

It is an amenable number.

1666011156 is an abundant number, since it is smaller than the sum of its proper divisors (2221348236).

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

1666011156 is a wasteful number, since it uses less digits than its factorization.

1666011156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138834270 (or 138834268 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1666011156 is about 40816.7999235609. The cubic root of 1666011156 is about 1185.4756423471.

The spelling of 1666011156 in words is "one billion, six hundred sixty-six million, eleven thousand, one hundred fifty-six".