1665655011 has 12 divisors (see below), whose sum is σ = 2470972192. Its totient is φ = 1080424656.

The previous prime is 1665655003. The next prime is 1665655027. The reversal of 1665655011 is 1105565661.

It is not a de Polignac number, because 1665655011 - 2³ = 1665655003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665655111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2500651 + ... + 2501316.

Almost surely, 2^1665655011 is an apocalyptic number.

1665655011 is a deficient number, since it is larger than the sum of its proper divisors (805317181).

1665655011 is a wasteful number, since it uses less digits than its factorization.

1665655011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002010 (or 5002007 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1665655011 is about 40812.4369647293. The cubic root of 1665655011 is about 1185.3911628586.

The spelling of 1665655011 in words is "one billion, six hundred sixty-five million, six hundred fifty-five thousand, eleven".