665701071 has 24 divisors (see below), whose sum is σ = 1033004160. Its totient is φ = 373442976.

The previous prime is 665701067. The next prime is 665701087. The reversal of 665701071 is 170107566.

It is not a de Polignac number, because 665701071 - 2² = 665701067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665701031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 907821 + ... + 908553.

It is an arithmetic number, because the mean of its divisors is an integer number (43041840).

Almost surely, 2^665701071 is an apocalyptic number.

665701071 is a deficient number, since it is larger than the sum of its proper divisors (367303089).

665701071 is an frugal number, since it uses more digits than its factorization.

665701071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 665701071 is about 25801.1835193659. The cubic root of 665701071 is about 873.1584981905.

The spelling of 665701071 in words is "six hundred sixty-five million, seven hundred one thousand, seventy-one".