668552505 has 8 divisors (see below), whose sum is σ = 1069684032. Its totient is φ = 356561328.

The previous prime is 668552491. The next prime is 668552509. The reversal of 668552505 is 505255866.

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

It is not a de Polignac number, because 668552505 - 2⁵ = 668552473 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (668552509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22285069 + ... + 22285098.

It is an arithmetic number, because the mean of its divisors is an integer number (133710504).

Almost surely, 2^668552505 is an apocalyptic number.

It is an amenable number.

668552505 is a deficient number, since it is larger than the sum of its proper divisors (401131527).

668552505 is a wasteful number, since it uses less digits than its factorization.

668552505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44570175.

The product of its (nonzero) digits is 360000, while the sum is 42.

The square root of 668552505 is about 25856.3822875514. The cubic root of 668552505 is about 874.4034050211.

The spelling of 668552505 in words is "six hundred sixty-eight million, five hundred fifty-two thousand, five hundred five".