6599901661 has 16 divisors (see below), whose sum is σ = 6788793600. Its totient is φ = 6414408000.

The previous prime is 6599901641. The next prime is 6599901667. The reversal of 6599901661 is 1661099956.

It is a cyclic number.

It is not a de Polignac number, because 6599901661 - 2⁹ = 6599901149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6599901599 and 6599901608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6599901667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1425931 + ... + 1430551.

It is an arithmetic number, because the mean of its divisors is an integer number (424299600).

Almost surely, 2^6599901661 is an apocalyptic number.

It is an amenable number.

6599901661 is a deficient number, since it is larger than the sum of its proper divisors (188891939).

6599901661 is a wasteful number, since it uses less digits than its factorization.

6599901661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4980.

The product of its (nonzero) digits is 787320, while the sum is 52.

The square root of 6599901661 is about 81239.7788093985. The cubic root of 6599901661 is about 1875.7681390540.

The spelling of 6599901661 in words is "six billion, five hundred ninety-nine million, nine hundred one thousand, six hundred sixty-one".