1665442055 has 36 divisors (see below), whose sum is σ = 2171642760. Its totient is φ = 1222737984.

The previous prime is 1665442003. The next prime is 1665442081. The reversal of 1665442055 is 5502445661.

It is not a de Polignac number, because 1665442055 - 2¹² = 1665437959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21081506 + ... + 21081584.

It is an arithmetic number, because the mean of its divisors is an integer number (60323410).

Almost surely, 2^1665442055 is an apocalyptic number.

1665442055 is a deficient number, since it is larger than the sum of its proper divisors (506200705).

1665442055 is an frugal number, since it uses more digits than its factorization.

1665442055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The square root of 1665442055 is about 40809.8279217151. The cubic root of 1665442055 is about 1185.3406428094.

The spelling of 1665442055 in words is "one billion, six hundred sixty-five million, four hundred forty-two thousand, fifty-five".