1211613666 has 16 divisors (see below), whose sum is σ = 2479581984. Its totient is φ = 394478784.

The previous prime is 1211613653. The next prime is 1211613677. The reversal of 1211613666 is 6663161121.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2347831 + ... + 2348346.

It is an arithmetic number, because the mean of its divisors is an integer number (154973874).

Almost surely, 2^1211613666 is an apocalyptic number.

1211613666 is an abundant number, since it is smaller than the sum of its proper divisors (1267968318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211613666 is a wasteful number, since it uses less digits than its factorization.

1211613666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4696225.

The product of its digits is 7776, while the sum is 33.

The square root of 1211613666 is about 34808.2413517259. The cubic root of 1211613666 is about 1066.0757249962.

Adding to 1211613666 its reverse (6663161121), we get a palindrome (7874774787).

The spelling of 1211613666 in words is "one billion, two hundred eleven million, six hundred thirteen thousand, six hundred sixty-six".