6615601605 has 12 divisors (see below), whose sum is σ = 11467042860. Its totient is φ = 3528320832.

The previous prime is 6615601579. The next prime is 6615601609. The reversal of 6615601605 is 5061065166.

It can be written as a sum of positive squares in 2 ways, for example, as 3994366401 + 2621235204 = 63201^2 + 51198^2 .

It is not a de Polignac number, because 6615601605 - 2⁶ = 6615601541 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6615601605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6615601609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73506640 + ... + 73506729.

It is an arithmetic number, because the mean of its divisors is an integer number (955586905).

Almost surely, 2^6615601605 is an apocalyptic number.

It is an amenable number.

6615601605 is a deficient number, since it is larger than the sum of its proper divisors (4851441255).

6615601605 is a wasteful number, since it uses less digits than its factorization.

6615601605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147013380 (or 147013377 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 6615601605 is about 81336.3486087247. The cubic root of 6615601605 is about 1877.2543295794.

The spelling of 6615601605 in words is "six billion, six hundred fifteen million, six hundred one thousand, six hundred five".