668562605 has 8 divisors (see below), whose sum is σ = 821843064. Its totient is φ = 521804800.

The previous prime is 668562577. The next prime is 668562613. The reversal of 668562605 is 506265866.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1012036 + 667550569 = 1006^2 + 25837^2 .

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

It is not a de Polignac number, because 668562605 - 2⁶ = 668562541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 1630436 + ... + 1630845.

It is an arithmetic number, because the mean of its divisors is an integer number (102730383).

Almost surely, 2^668562605 is an apocalyptic number.

It is an amenable number.

668562605 is a deficient number, since it is larger than the sum of its proper divisors (153280459).

668562605 is a wasteful number, since it uses less digits than its factorization.

668562605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261327.

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 668562605 is about 25856.5775964260. The cubic root of 668562605 is about 874.4078082803.

The spelling of 668562605 in words is "six hundred sixty-eight million, five hundred sixty-two thousand, six hundred five".