665465512 has 8 divisors (see below), whose sum is σ = 1247747850. Its totient is φ = 332732752.

The previous prime is 665465503. The next prime is 665465513. The reversal of 665465512 is 215564566.

It can be written as a sum of positive squares in only one way, i.e., 431559076 + 233906436 = 20774^2 + 15294^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-4 number, since 4×665465512⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (665465513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41591587 + ... + 41591602.

Almost surely, 2^665465512 is an apocalyptic number.

It is an amenable number.

665465512 is a deficient number, since it is larger than the sum of its proper divisors (582282338).

665465512 is a wasteful number, since it uses less digits than its factorization.

665465512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83183195 (or 83183191 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 665465512 is about 25796.6182279771. The cubic root of 665465512 is about 873.0554967001.

The spelling of 665465512 in words is "six hundred sixty-five million, four hundred sixty-five thousand, five hundred twelve".