6616061321 has 8 divisors (see below), whose sum is σ = 6708160680. Its totient is φ = 6524001792.

The previous prime is 6616061303. The next prime is 6616061339. The reversal of 6616061321 is 1231606166.

It is an interprime number because it is at equal distance from previous prime (6616061303) and next prime (6616061339).

It can be written as a sum of positive squares in 4 ways, for example, as 3212622400 + 3403438921 = 56680^2 + 58339^2 .

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 6616061321 - 2¹⁴ = 6616044937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6616061821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514061 + ... + 526773.

It is an arithmetic number, because the mean of its divisors is an integer number (838520085).

Almost surely, 2^6616061321 is an apocalyptic number.

It is an amenable number.

6616061321 is a deficient number, since it is larger than the sum of its proper divisors (92099359).

6616061321 is a wasteful number, since it uses less digits than its factorization.

6616061321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19915.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6616061321 is about 81339.1745778134. The cubic root of 6616061321 is about 1877.2978118362.

Adding to 6616061321 its reverse (1231606166), we get a palindrome (7847667487).

The spelling of 6616061321 in words is "six billion, six hundred sixteen million, sixty-one thousand, three hundred twenty-one".