668652013 has 4 divisors (see below), whose sum is σ = 669199968. Its totient is φ = 668104060.

The previous prime is 668652011. The next prime is 668652029. The reversal of 668652013 is 310256866.

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.

It is a cyclic number.

It is not a de Polignac number, because 668652013 - 2¹ = 668652011 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 (668652011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272143 + ... + 274588.

It is an arithmetic number, because the mean of its divisors is an integer number (167299992).

Almost surely, 2^668652013 is an apocalyptic number.

It is an amenable number.

668652013 is a deficient number, since it is larger than the sum of its proper divisors (547955).

668652013 is a wasteful number, since it uses less digits than its factorization.

668652013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547954.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 668652013 is about 25858.3064604007. The cubic root of 668652013 is about 874.4467852177.

The spelling of 668652013 in words is "six hundred sixty-eight million, six hundred fifty-two thousand, thirteen".