1666085201 has 16 divisors (see below), whose sum is σ = 1902296448. Its totient is φ = 1444396800.

The previous prime is 1666085189. The next prime is 1666085209. The reversal of 1666085201 is 1025806661.

It is a happy number.

It is not a de Polignac number, because 1666085201 - 2²² = 1661890897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666085209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75491 + ... + 95031.

It is an arithmetic number, because the mean of its divisors is an integer number (118893528).

Almost surely, 2^1666085201 is an apocalyptic number.

1666085201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1666085201 is a deficient number, since it is larger than the sum of its proper divisors (236211247).

1666085201 is a wasteful number, since it uses less digits than its factorization.

1666085201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19912.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1666085201 is about 40817.7069542129. The cubic root of 1666085201 is about 1185.4932047032.

The spelling of 1666085201 in words is "one billion, six hundred sixty-six million, eighty-five thousand, two hundred one".