6613725621 has 8 divisors (see below), whose sum is σ = 9033381504. Its totient is φ = 4301610080.

The previous prime is 6613725619. The next prime is 6613725623. The reversal of 6613725621 is 1265273166.

It is an interprime number because it is at equal distance from previous prime (6613725619) and next prime (6613725623).

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

It is a cyclic number.

It is not a de Polignac number, because 6613725621 - 2¹ = 6613725619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6613725621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6613725623) 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, 26884941 + ... + 26885186.

It is an arithmetic number, because the mean of its divisors is an integer number (1129172688).

Almost surely, 2^6613725621 is an apocalyptic number.

It is an amenable number.

6613725621 is a deficient number, since it is larger than the sum of its proper divisors (2419655883).

6613725621 is a wasteful number, since it uses less digits than its factorization.

6613725621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53770171.

The product of its digits is 90720, while the sum is 39.

The square root of 6613725621 is about 81324.8155300705. The cubic root of 6613725621 is about 1877.0768686705.

Adding to 6613725621 its reverse (1265273166), we get a palindrome (7878998787).

The spelling of 6613725621 in words is "six billion, six hundred thirteen million, seven hundred twenty-five thousand, six hundred twenty-one".