1201220665 has 8 divisors (see below), whose sum is σ = 1476622728. Its totient is φ = 937537920.

The previous prime is 1201220653. The next prime is 1201220693. The reversal of 1201220665 is 5660221021.

It can be written as a sum of positive squares in 4 ways, for example, as 64384576 + 1136836089 = 8024^2 + 33717^2 .

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

It is not a de Polignac number, because 1201220665 - 2⁵ = 1201220633 is a prime.

It is a Duffinian 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, 2929602 + ... + 2930011.

It is an arithmetic number, because the mean of its divisors is an integer number (184577841).

Almost surely, 2^1201220665 is an apocalyptic number.

It is an amenable number.

1201220665 is a deficient number, since it is larger than the sum of its proper divisors (275402063).

1201220665 is an equidigital number, since it uses as much as digits as its factorization.

1201220665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5859659.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1201220665 is about 34658.6304547655. The cubic root of 1201220665 is about 1063.0187665552.

Adding to 1201220665 its reverse (5660221021), we get a palindrome (6861441686).

The spelling of 1201220665 in words is "one billion, two hundred one million, two hundred twenty thousand, six hundred sixty-five".