664111361 has 8 divisors (see below), whose sum is σ = 694308480. Its totient is φ = 635225316.

The previous prime is 664111333. The next prime is 664111391. The reversal of 664111361 is 163111466.

It is a de Polignac number, because none of the positive numbers 2^k-664111361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664111391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15125 + ... + 39458.

It is an arithmetic number, because the mean of its divisors is an integer number (86788560).

Almost surely, 2^664111361 is an apocalyptic number.

It is an amenable number.

664111361 is a deficient number, since it is larger than the sum of its proper divisors (30197119).

664111361 is an frugal number, since it uses more digits than its factorization.

664111361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54652 (or 54606 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 664111361 is about 25770.3581853260. The cubic root of 664111361 is about 872.4629031061.

The spelling of 664111361 in words is "six hundred sixty-four million, one hundred eleven thousand, three hundred sixty-one".