665055601 has 16 divisors (see below), whose sum is σ = 772793344. Its totient is φ = 560531664.

The previous prime is 665055583. The next prime is 665055619. The reversal of 665055601 is 106550566.

It is an interprime number because it is at equal distance from previous prime (665055583) and next prime (665055619).

It is not a de Polignac number, because 665055601 - 2⁵ = 665055569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665055401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385126 + ... + 386848.

It is an arithmetic number, because the mean of its divisors is an integer number (48299584).

Almost surely, 2^665055601 is an apocalyptic number.

It is an amenable number.

665055601 is a deficient number, since it is larger than the sum of its proper divisors (107737743).

665055601 is a wasteful number, since it uses less digits than its factorization.

665055601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 665055601 is about 25788.6719510719. The cubic root of 665055601 is about 872.8761993755.

The spelling of 665055601 in words is "six hundred sixty-five million, fifty-five thousand, six hundred one".