665740160 has 32 divisors (see below), whose sum is σ = 1591536600. Its totient is φ = 266295808.

The previous prime is 665740151. The next prime is 665740169. The reversal of 665740160 is 61047566.

It is an interprime number because it is at equal distance from previous prime (665740151) and next prime (665740169).

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 665740160.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665740169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519470 + ... + 520749.

Almost surely, 2^665740160 is an apocalyptic number.

It is an amenable number.

665740160 is an abundant number, since it is smaller than the sum of its proper divisors (925796440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665740160 is a wasteful number, since it uses less digits than its factorization.

665740160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040238 (or 1040226 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 665740160 is about 25801.9410122572. The cubic root of 665740160 is about 873.1755880556.

The spelling of 665740160 in words is "six hundred sixty-five million, seven hundred forty thousand, one hundred sixty".