665894653334 has 4 divisors (see below), whose sum is σ = 998841980004. Its totient is φ = 332947326666.

The previous prime is 665894653289. The next prime is 665894653337. The reversal of 665894653334 is 433356498566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665894653337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166473663332 + ... + 166473663335.

It is an arithmetic number, because the mean of its divisors is an integer number (249710495001).

Almost surely, 2^665894653334 is an apocalyptic number.

665894653334 is a deficient number, since it is larger than the sum of its proper divisors (332947326670).

665894653334 is a wasteful number, since it uses less digits than its factorization.

665894653334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332947326669.

The product of its digits is 167961600, while the sum is 62.

The spelling of 665894653334 in words is "six hundred sixty-five billion, eight hundred ninety-four million, six hundred fifty-three thousand, three hundred thirty-four".