1666642532 has 24 divisors (see below), whose sum is σ = 3250729440. Its totient is φ = 743022720.

The previous prime is 1666642529. The next prime is 1666642559. The reversal of 1666642532 is 2352466661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666642532.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643694 + ... + 646277.

It is an arithmetic number, because the mean of its divisors is an integer number (135447060).

Almost surely, 2^1666642532 is an apocalyptic number.

It is an amenable number.

1666642532 is a deficient number, since it is larger than the sum of its proper divisors (1584086908).

1666642532 is a wasteful number, since it uses less digits than its factorization.

1666642532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290011 (or 1290009 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 1666642532 is about 40824.5334572240. The cubic root of 1666642532 is about 1185.6253785068.

The spelling of 1666642532 in words is "one billion, six hundred sixty-six million, six hundred forty-two thousand, five hundred thirty-two".