1166020001 has 4 divisors (see below), whose sum is σ = 1166201412. Its totient is φ = 1165838592.

The previous prime is 1166019997. The next prime is 1166020027. The reversal of 1166020001 is 1000206611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 579653776 + 586366225 = 24076^2 + 24215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166020001 - 2² = 1166019997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166020091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80696 + ... + 94041.

It is an arithmetic number, because the mean of its divisors is an integer number (291550353).

Almost surely, 2^1166020001 is an apocalyptic number.

It is an amenable number.

1166020001 is a deficient number, since it is larger than the sum of its proper divisors (181411).

1166020001 is an equidigital number, since it uses as much as digits as its factorization.

1166020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181410.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1166020001 is about 34147.0350250208. The cubic root of 1166020001 is about 1052.5320601906.

Adding to 1166020001 its reverse (1000206611), we get a palindrome (2166226612).

The spelling of 1166020001 in words is "one billion, one hundred sixty-six million, twenty thousand, one".