6506561501 has 8 divisors (see below), whose sum is σ = 7168346208. Its totient is φ = 5856490000.

The previous prime is 6506561491. The next prime is 6506561527. The reversal of 6506561501 is 1051656056.

6506561501 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6506561501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6506561531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2927135 + ... + 2929356.

It is an arithmetic number, because the mean of its divisors is an integer number (896043276).

Almost surely, 2^6506561501 is an apocalyptic number.

It is an amenable number.

6506561501 is a deficient number, since it is larger than the sum of its proper divisors (661784707).

6506561501 is a wasteful number, since it uses less digits than its factorization.

6506561501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856603.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 6506561501 is about 80663.2599204867. The cubic root of 6506561501 is about 1866.8833383943.

The spelling of 6506561501 in words is "six billion, five hundred six million, five hundred sixty-one thousand, five hundred one".