666355013 has 4 divisors (see below), whose sum is σ = 687850368. Its totient is φ = 644859660.

The previous prime is 666355009. The next prime is 666355021. The reversal of 666355013 is 310553666.

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: 310553666 = 2 ⋅155276833.

It is a cyclic number.

It is not a de Polignac number, because 666355013 - 2² = 666355009 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 (666355003) 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, 10747631 + ... + 10747692.

It is an arithmetic number, because the mean of its divisors is an integer number (171962592).

Almost surely, 2^666355013 is an apocalyptic number.

It is an amenable number.

666355013 is a deficient number, since it is larger than the sum of its proper divisors (21495355).

666355013 is a wasteful number, since it uses less digits than its factorization.

666355013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21495354.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 666355013 is about 25813.8531219189. The cubic root of 666355013 is about 873.4443162410. Note that the first 3 decimals are identical.

The spelling of 666355013 in words is "six hundred sixty-six million, three hundred fifty-five thousand, thirteen".