1201217665 has 8 divisors (see below), whose sum is σ = 1504133568. Its totient is φ = 919192560.

The previous prime is 1201217657. The next prime is 1201217669. The reversal of 1201217665 is 5667121021.

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

It is not a de Polignac number, because 1201217665 - 2³ = 1201217657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201217669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5222571 + ... + 5222800.

It is an arithmetic number, because the mean of its divisors is an integer number (188016696).

Almost surely, 2^1201217665 is an apocalyptic number.

It is an amenable number.

1201217665 is a deficient number, since it is larger than the sum of its proper divisors (302915903).

1201217665 is a wasteful number, since it uses less digits than its factorization.

1201217665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10445399.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1201217665 is about 34658.5871754750. The cubic root of 1201217665 is about 1063.0178816057.

Adding to 1201217665 its reverse (5667121021), we get a palindrome (6868338686).

The spelling of 1201217665 in words is "one billion, two hundred one million, two hundred seventeen thousand, six hundred sixty-five".