665611360 has 48 divisors (see below), whose sum is σ = 1576120896. Its totient is φ = 265632768.

The previous prime is 665611357. The next prime is 665611367. The reversal of 665611360 is 63116566.

It is a super-2 number, since 2×665611360² = 886076965122099200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665611367) 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, 68569 + ... + 77671.

It is an arithmetic number, because the mean of its divisors is an integer number (32835852).

Almost surely, 2^665611360 is an apocalyptic number.

It is an amenable number.

665611360 is an abundant number, since it is smaller than the sum of its proper divisors (910509536).

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

665611360 is a wasteful number, since it uses less digits than its factorization.

665611360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9575 (or 9567 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 665611360 is about 25799.4449552699. Note that the first 3 decimals coincide. The cubic root of 665611360 is about 873.1192736575.

The spelling of 665611360 in words is "six hundred sixty-five million, six hundred eleven thousand, three hundred sixty".