656621013 has 8 divisors (see below), whose sum is σ = 903736576. Its totient is φ = 423626400.

The previous prime is 656621011. The next prime is 656621023. The reversal of 656621013 is 310126656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656621013 - 2¹ = 656621011 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 (656621011) 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 7 ways as a sum of consecutive naturals, for example, 3530128 + ... + 3530313.

It is an arithmetic number, because the mean of its divisors is an integer number (112967072).

Almost surely, 2^656621013 is an apocalyptic number.

It is an amenable number.

656621013 is a deficient number, since it is larger than the sum of its proper divisors (247115563).

656621013 is a wasteful number, since it uses less digits than its factorization.

656621013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060475.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 656621013 is about 25624.6173239719. The cubic root of 656621013 is about 869.1703955853.

Adding to 656621013 its reverse (310126656), we get a palindrome (966747669).

The spelling of 656621013 in words is "six hundred fifty-six million, six hundred twenty-one thousand, thirteen".