1211065655 has 8 divisors (see below), whose sum is σ = 1471675200. Its totient is φ = 956588256.

The previous prime is 1211065633. The next prime is 1211065663. The reversal of 1211065655 is 5565601121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211065655 - 2¹² = 1211061559 is a prime.

It is a congruent number.

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, 1532600 + ... + 1533389.

It is an arithmetic number, because the mean of its divisors is an integer number (183959400).

Almost surely, 2^1211065655 is an apocalyptic number.

1211065655 is a deficient number, since it is larger than the sum of its proper divisors (260609545).

1211065655 is an equidigital number, since it uses as much as digits as its factorization.

1211065655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066073.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1211065655 is about 34800.3686043697. The cubic root of 1211065655 is about 1065.9149726201.

Adding to 1211065655 its reverse (5565601121), we get a palindrome (6776666776).

The spelling of 1211065655 in words is "one billion, two hundred eleven million, sixty-five thousand, six hundred fifty-five".