6623557613 has 4 divisors (see below), whose sum is σ = 6623807520. Its totient is φ = 6623307708.

The previous prime is 6623557597. The next prime is 6623557637. The reversal of 6623557613 is 3167553266.

It is a happy number.

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 6623557613 - 2⁴ = 6623557597 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 (6623557013) 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, 79745 + ... + 140022.

It is an arithmetic number, because the mean of its divisors is an integer number (1655951880).

Almost surely, 2^6623557613 is an apocalyptic number.

It is an amenable number.

6623557613 is a deficient number, since it is larger than the sum of its proper divisors (249907).

6623557613 is a wasteful number, since it uses less digits than its factorization.

6623557613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249906.

The product of its digits is 680400, while the sum is 44.

The square root of 6623557613 is about 81385.2419852641. The cubic root of 6623557613 is about 1878.0065648844.

The spelling of 6623557613 in words is "six billion, six hundred twenty-three million, five hundred fifty-seven thousand, six hundred thirteen".