668031505 has 8 divisors (see below), whose sum is σ = 811785600. Its totient is φ = 527660016.

The previous prime is 668031457. The next prime is 668031577. The reversal of 668031505 is 505130866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668031505 is a prime.

It is a super-3 number, since 3×668031505³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845215 + ... + 846004.

It is an arithmetic number, because the mean of its divisors is an integer number (101473200).

Almost surely, 2^668031505 is an apocalyptic number.

It is an amenable number.

668031505 is a deficient number, since it is larger than the sum of its proper divisors (143754095).

668031505 is a wasteful number, since it uses less digits than its factorization.

668031505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691303.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 668031505 is about 25846.3054419776. The cubic root of 668031505 is about 874.1762064283.

The spelling of 668031505 in words is "six hundred sixty-eight million, thirty-one thousand, five hundred five".