666613001 has 4 divisors (see below), whose sum is σ = 667225104. Its totient is φ = 666000900.

The previous prime is 666612983. The next prime is 666613039. The reversal of 666613001 is 100316666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100316666 = 2 ⋅50158333.

It is a cyclic number.

It is not a de Polignac number, because 666613001 - 2¹⁰ = 666611977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666613901) 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 3 ways as a sum of consecutive naturals, for example, 304415 + ... + 306596.

It is an arithmetic number, because the mean of its divisors is an integer number (166806276).

Almost surely, 2^666613001 is an apocalyptic number.

It is an amenable number.

666613001 is a deficient number, since it is larger than the sum of its proper divisors (612103).

666613001 is a wasteful number, since it uses less digits than its factorization.

666613001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612102.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 666613001 is about 25818.8497226348. The cubic root of 666613001 is about 873.5570234683.

Adding to 666613001 its reverse (100316666), we get a palindrome (766929667).

The spelling of 666613001 in words is "six hundred sixty-six million, six hundred thirteen thousand, one".