665361611 has 8 divisors (see below), whose sum is σ = 670195344. Its totient is φ = 660540960.

The previous prime is 665361607. The next prime is 665361617. The reversal of 665361611 is 116163566.

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 665361611 - 2² = 665361607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665361617) 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, 113525 + ... + 119241.

It is an arithmetic number, because the mean of its divisors is an integer number (83774418).

Almost surely, 2^665361611 is an apocalyptic number.

665361611 is a deficient number, since it is larger than the sum of its proper divisors (4833733).

665361611 is a wasteful number, since it uses less digits than its factorization.

665361611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6541.

The product of its digits is 19440, while the sum is 35.

The square root of 665361611 is about 25794.6043001245. The cubic root of 665361611 is about 873.0100567993.

The spelling of 665361611 in words is "six hundred sixty-five million, three hundred sixty-one thousand, six hundred eleven".