6493805661 has 16 divisors (see below), whose sum is σ = 9924696704. Its totient is φ = 3699730944.

The previous prime is 6493805627. The next prime is 6493805699. The reversal of 6493805661 is 1665083946.

6493805661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6493805661 - 2¹³ = 6493797469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6493805661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6493815661) 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 15 ways as a sum of consecutive naturals, for example, 451720 + ... + 465873.

It is an arithmetic number, because the mean of its divisors is an integer number (620293544).

Almost surely, 2^6493805661 is an apocalyptic number.

It is an amenable number.

6493805661 is a deficient number, since it is larger than the sum of its proper divisors (3430891043).

6493805661 is a wasteful number, since it uses less digits than its factorization.

6493805661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917940.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 6493805661 is about 80584.1526666379. The cubic root of 6493805661 is about 1865.6625582107.

The spelling of 6493805661 in words is "six billion, four hundred ninety-three million, eight hundred five thousand, six hundred sixty-one".