1201310666 has 4 divisors (see below), whose sum is σ = 1801966002. Its totient is φ = 600655332.

The previous prime is 1201310633. The next prime is 1201310683. The reversal of 1201310666 is 6660131021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6660131021 = 17 ⋅391772413.

It can be written as a sum of positive squares in only one way, i.e., 969388225 + 231922441 = 31135^2 + 15229^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300327665 + ... + 300327668.

Almost surely, 2^1201310666 is an apocalyptic number.

1201310666 is a deficient number, since it is larger than the sum of its proper divisors (600655336).

1201310666 is an equidigital number, since it uses as much as digits as its factorization.

1201310666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600655335.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1201310666 is about 34659.9288227775. The cubic root of 1201310666 is about 1063.0453146507.

Adding to 1201310666 its reverse (6660131021), we get a palindrome (7861441687).

The spelling of 1201310666 in words is "one billion, two hundred one million, three hundred ten thousand, six hundred sixty-six".