665011361 has 16 divisors (see below), whose sum is σ = 774334080. Its totient is φ = 559305600.

The previous prime is 665011357. The next prime is 665011367. The reversal of 665011361 is 163110566.

It is not a de Polignac number, because 665011361 - 2² = 665011357 is a prime.

It is a super-2 number, since 2×665011361² = 884480220518144642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665011367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288365 + ... + 290661.

It is an arithmetic number, because the mean of its divisors is an integer number (48395880).

Almost surely, 2^665011361 is an apocalyptic number.

It is an amenable number.

665011361 is a deficient number, since it is larger than the sum of its proper divisors (109322719).

665011361 is a wasteful number, since it uses less digits than its factorization.

665011361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 665011361 is about 25787.8141958562. The cubic root of 665011361 is about 872.8568441520.

The spelling of 665011361 in words is "six hundred sixty-five million, eleven thousand, three hundred sixty-one".