6539428661 has 4 divisors (see below), whose sum is σ = 6539616000. Its totient is φ = 6539241324.

The previous prime is 6539428657. The next prime is 6539428663. The reversal of 6539428661 is 1668249356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6539428661 - 2² = 6539428657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539428663) 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 3 ways as a sum of consecutive naturals, for example, 24071 + ... + 116868.

It is an arithmetic number, because the mean of its divisors is an integer number (1634904000).

Almost surely, 2^6539428661 is an apocalyptic number.

It is an amenable number.

6539428661 is a deficient number, since it is larger than the sum of its proper divisors (187339).

6539428661 is a wasteful number, since it uses less digits than its factorization.

6539428661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187338.

The product of its digits is 1866240, while the sum is 50.

The square root of 6539428661 is about 80866.7339577901. The cubic root of 6539428661 is about 1870.0215103286.

The spelling of 6539428661 in words is "six billion, five hundred thirty-nine million, four hundred twenty-eight thousand, six hundred sixty-one".