1665606236 has 18 divisors (see below), whose sum is σ = 3390698808. Its totient is φ = 713831160.

The previous prime is 1665606211. The next prime is 1665606269. The reversal of 1665606236 is 6326065661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1665606193 and 1665606202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4248800 + ... + 4249191.

It is an arithmetic number, because the mean of its divisors is an integer number (188372156).

Almost surely, 2^1665606236 is an apocalyptic number.

It is an amenable number.

1665606236 is an abundant number, since it is smaller than the sum of its proper divisors (1725092572).

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

1665606236 is a wasteful number, since it uses less digits than its factorization.

1665606236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8498009 (or 8498000 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 1665606236 is about 40811.8394096615. The cubic root of 1665606236 is about 1185.3795922316.

The spelling of 1665606236 in words is "one billion, six hundred sixty-five million, six hundred six thousand, two hundred thirty-six".