665535636 has 48 divisors (see below), whose sum is σ = 1800489600. Its totient is φ = 212198976.

The previous prime is 665535631. The next prime is 665535679. The reversal of 665535636 is 636535566.

665535636 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 3 + 5 + 636 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 665535591 and 665535600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665535631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131481 + ... + 136448.

It is an arithmetic number, because the mean of its divisors is an integer number (37510200).

Almost surely, 2^665535636 is an apocalyptic number.

It is an amenable number.

665535636 is an abundant number, since it is smaller than the sum of its proper divisors (1134953964).

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

665535636 is a wasteful number, since it uses less digits than its factorization.

665535636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267965 (or 267957 counting only the distinct ones).

The product of its digits is 1458000, while the sum is 45.

The square root of 665535636 is about 25797.9773625763. The cubic root of 665535636 is about 873.0861619473.

The spelling of 665535636 in words is "six hundred sixty-five million, five hundred thirty-five thousand, six hundred thirty-six".