665006205071 has 24 divisors (see below), whose sum is σ = 778676618304. Its totient is φ = 565450429440.

The previous prime is 665006205041. The next prime is 665006205089. The reversal of 665006205071 is 170502600566.

It is not a de Polignac number, because 665006205071 - 2⁶ = 665006205007 is a prime.

It is a super-2 number, since 2×665006205071² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665006205041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2327390 + ... + 2597451.

It is an arithmetic number, because the mean of its divisors is an integer number (32444859096).

Almost surely, 2^665006205071 is an apocalyptic number.

665006205071 is a deficient number, since it is larger than the sum of its proper divisors (113670413233).

665006205071 is a wasteful number, since it uses less digits than its factorization.

665006205071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924931 (or 4924918 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 665006205071 in words is "six hundred sixty-five billion, six million, two hundred five thousand, seventy-one".