668193061 has 4 divisors (see below), whose sum is σ = 670793292. Its totient is φ = 665592832.

The previous prime is 668193059. The next prime is 668193131. The reversal of 668193061 is 160391866.

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 391802436 + 276390625 = 19794^2 + 16625^2 .

It is a cyclic number.

It is not a de Polignac number, because 668193061 - 2¹ = 668193059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668193011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1299730 + ... + 1300243.

It is an arithmetic number, because the mean of its divisors is an integer number (167698323).

Almost surely, 2^668193061 is an apocalyptic number.

It is an amenable number.

668193061 is a deficient number, since it is larger than the sum of its proper divisors (2600231).

668193061 is a wasteful number, since it uses less digits than its factorization.

668193061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600230.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 668193061 is about 25849.4305739991. The cubic root of 668193061 is about 874.2466706838.

The spelling of 668193061 in words is "six hundred sixty-eight million, one hundred ninety-three thousand, sixty-one".