665603464836 has 12 divisors (see below), whose sum is σ = 1553074751312. Its totient is φ = 221867821608.

The previous prime is 665603464831. The next prime is 665603464853. The reversal of 665603464836 is 638464306566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (665603464831) 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, 27733477690 + ... + 27733477713.

Almost surely, 2^665603464836 is an apocalyptic number.

It is an amenable number.

665603464836 is an abundant number, since it is smaller than the sum of its proper divisors (887471286476).

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

665603464836 is a wasteful number, since it uses less digits than its factorization.

665603464836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55466955410 (or 55466955408 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 57.

The spelling of 665603464836 in words is "six hundred sixty-five billion, six hundred three million, four hundred sixty-four thousand, eight hundred thirty-six".