665536212 has 36 divisors (see below), whose sum is σ = 1835267616. Its totient is φ = 201677520.

The previous prime is 665536181. The next prime is 665536217. The reversal of 665536212 is 212635566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665536217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 839928 + ... + 840719.

It is an arithmetic number, because the mean of its divisors is an integer number (50979656).

Almost surely, 2^665536212 is an apocalyptic number.

It is an amenable number.

665536212 is an abundant number, since it is smaller than the sum of its proper divisors (1169731404).

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

665536212 is a wasteful number, since it uses less digits than its factorization.

665536212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680668 (or 1680663 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 665536212 is about 25797.9885262398. The cubic root of 665536212 is about 873.0864138234.

The spelling of 665536212 in words is "six hundred sixty-five million, five hundred thirty-six thousand, two hundred twelve".