6601428561 has 32 divisors (see below), whose sum is σ = 10893046528. Its totient is φ = 3462808320.

The previous prime is 6601428551. The next prime is 6601428563. The reversal of 6601428561 is 1658241066.

It is a happy number.

It is not a de Polignac number, because 6601428561 - 2⁵ = 6601428529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (6601428563) 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 31 ways as a sum of consecutive naturals, for example, 17386 + ... + 116211.

It is an arithmetic number, because the mean of its divisors is an integer number (340407704).

Almost surely, 2^6601428561 is an apocalyptic number.

It is an amenable number.

6601428561 is a deficient number, since it is larger than the sum of its proper divisors (4291617967).

6601428561 is a wasteful number, since it uses less digits than its factorization.

6601428561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133801.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 6601428561 is about 81249.1757558192. The cubic root of 6601428561 is about 1875.9127820944.

The spelling of 6601428561 in words is "six billion, six hundred one million, four hundred twenty-eight thousand, five hundred sixty-one".