668336515505 has 4 divisors (see below), whose sum is σ = 802003818612. Its totient is φ = 534669212400.

The previous prime is 668336515499. The next prime is 668336515519. The reversal of 668336515505 is 505515633866.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 411045112384 + 257291403121 = 641128^2 + 507239^2 .

It is not a de Polignac number, because 668336515505 - 2¹⁰ = 668336514481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66833651546 + ... + 66833651555.

It is an arithmetic number, because the mean of its divisors is an integer number (200500954653).

Almost surely, 2^668336515505 is an apocalyptic number.

It is an amenable number.

668336515505 is a deficient number, since it is larger than the sum of its proper divisors (133667303107).

668336515505 is a wasteful number, since it uses less digits than its factorization.

668336515505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133667303106.

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 668336515505 in words is "six hundred sixty-eight billion, three hundred thirty-six million, five hundred fifteen thousand, five hundred five".