1666120524 has 12 divisors (see below), whose sum is σ = 3887614584. Its totient is φ = 555373504.

The previous prime is 1666120459. The next prime is 1666120541. The reversal of 1666120524 is 4250216661.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69421677 + ... + 69421700.

It is an arithmetic number, because the mean of its divisors is an integer number (323967882).

Almost surely, 2^1666120524 is an apocalyptic number.

It is an amenable number.

1666120524 is an abundant number, since it is smaller than the sum of its proper divisors (2221494060).

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

1666120524 is a wasteful number, since it uses less digits than its factorization.

1666120524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138843384 (or 138843382 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1666120524 is about 40818.1396440357. The cubic root of 1666120524 is about 1185.5015826022.

The spelling of 1666120524 in words is "one billion, six hundred sixty-six million, one hundred twenty thousand, five hundred twenty-four".