665358243566 has 4 divisors (see below), whose sum is σ = 998037365352. Its totient is φ = 332679121782.

The previous prime is 665358243541. The next prime is 665358243629. The reversal of 665358243566 is 665342853566.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166339560890 + ... + 166339560893.

It is an arithmetic number, because the mean of its divisors is an integer number (249509341338).

Almost surely, 2^665358243566 is an apocalyptic number.

665358243566 is a deficient number, since it is larger than the sum of its proper divisors (332679121786).

665358243566 is a wasteful number, since it uses less digits than its factorization.

665358243566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332679121785.

The product of its digits is 93312000, while the sum is 59.

The spelling of 665358243566 in words is "six hundred sixty-five billion, three hundred fifty-eight million, two hundred forty-three thousand, five hundred sixty-six".