668266061 has 4 divisors (see below), whose sum is σ = 669716124. Its totient is φ = 666816000.

The previous prime is 668266057. The next prime is 668266087. The reversal of 668266061 is 160662866.

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 132112036 + 536154025 = 11494^2 + 23155^2 .

It is a cyclic number.

It is not a de Polignac number, because 668266061 - 2² = 668266057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668266561) 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, 724340 + ... + 725261.

It is an arithmetic number, because the mean of its divisors is an integer number (167429031).

Almost surely, 2^668266061 is an apocalyptic number.

It is an amenable number.

668266061 is a deficient number, since it is larger than the sum of its proper divisors (1450063).

668266061 is a wasteful number, since it uses less digits than its factorization.

668266061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450062.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 668266061 is about 25850.8425588026. The cubic root of 668266061 is about 874.2785066339.

The spelling of 668266061 in words is "six hundred sixty-eight million, two hundred sixty-six thousand, sixty-one".